usb: gadget: add usb_endpoint_descriptor to struct usb_ep

Change usb_ep_enable() prototype to use endpoint
descriptor from usb_ep.

This optimization spares the FDs from saving the
endpoint chosen descriptor. This optimization is
not full though. To fully exploit this change, one
needs to update all the UDCs as well since in the
current implementation each of them saves the
endpoint descriptor in it's internal (and extended)
endpoint structure.

Signed-off-by: Tatyana Brokhman <tlinder@codeaurora.org>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

26 files changed, 111 insertions, 117 deletions

diff --git a/drivers/usb/gadget/dbgp.c b/drivers/usb/gadget/dbgp.c
index dbe92ee8847..052209e8927 100644
--- a/drivers/usb/gadget/dbgp.c
+++ b/drivers/usb/gadget/dbgp.c
@@ -173,7 +173,9 @@ fail_1:
 
 static int __enable_ep(struct usb_ep *ep, struct usb_endpoint_descriptor *desc)
 {
-	int err = usb_ep_enable(ep, desc);
+	int err;
+	ep->desc = desc;
+	err = usb_ep_enable(ep);
 	ep->driver_data = dbgp.gadget;
 	return err;
 }
@@ -268,8 +270,8 @@ static int __init dbgp_configure_endpoints(struct usb_gadget *gadget)
 	dbgp.serial->in = dbgp.i_ep;
 	dbgp.serial->out = dbgp.o_ep;
 
-	dbgp.serial->in_desc = &i_desc;
-	dbgp.serial->out_desc = &o_desc;
+	dbgp.serial->in->desc = &i_desc;
+	dbgp.serial->out->desc = &o_desc;
 
 	if (gserial_setup(gadget, 1) < 0) {
 		stp = 3;
diff --git a/drivers/usb/gadget/f_acm.c b/drivers/usb/gadget/f_acm.c
index bd6226cbae8..d04b4a68220 100644
--- a/drivers/usb/gadget/f_acm.c
+++ b/drivers/usb/gadget/f_acm.c
@@ -62,7 +62,6 @@ struct f_acm {
 	struct acm_ep_descs		hs;
 
 	struct usb_ep			*notify;
-	struct usb_endpoint_descriptor	*notify_desc;
 	struct usb_request		*notify_req;
 
 	struct usb_cdc_line_coding	port_line_coding;	/* 8-N-1 etc */
@@ -405,11 +404,11 @@ static int acm_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 			usb_ep_disable(acm->notify);
 		} else {
 			VDBG(cdev, "init acm ctrl interface %d\n", intf);
-			acm->notify_desc = ep_choose(cdev->gadget,
+			acm->notify->desc = ep_choose(cdev->gadget,
 					acm->hs.notify,
 					acm->fs.notify);
 		}
-		usb_ep_enable(acm->notify, acm->notify_desc);
+		usb_ep_enable(acm->notify);
 		acm->notify->driver_data = acm;
 
 	} else if (intf == acm->data_id) {
@@ -418,9 +417,9 @@ static int acm_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 			gserial_disconnect(&acm->port);
 		} else {
 			DBG(cdev, "activate acm ttyGS%d\n", acm->port_num);
-			acm->port.in_desc = ep_choose(cdev->gadget,
+			acm->port.in->desc = ep_choose(cdev->gadget,
 					acm->hs.in, acm->fs.in);
-			acm->port.out_desc = ep_choose(cdev->gadget,
+			acm->port.out->desc = ep_choose(cdev->gadget,
 					acm->hs.out, acm->fs.out);
 		}
 		gserial_connect(&acm->port, acm->port_num);
diff --git a/drivers/usb/gadget/f_audio.c b/drivers/usb/gadget/f_audio.c
index 8ee330a2ab5..02a02700b51 100644
--- a/drivers/usb/gadget/f_audio.c
+++ b/drivers/usb/gadget/f_audio.c
@@ -279,7 +279,6 @@ struct f_audio {
 
 	/* endpoints handle full and/or high speeds */
 	struct usb_ep			*out_ep;
-	struct usb_endpoint_descriptor	*out_desc;
 
 	spinlock_t			lock;
 	struct f_audio_buf *copy_buf;
@@ -575,7 +574,7 @@ static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 
 	if (intf == 1) {
 		if (alt == 1) {
-			usb_ep_enable(out_ep, audio->out_desc);
+			usb_ep_enable(out_ep);
 			out_ep->driver_data = audio;
 			audio->copy_buf = f_audio_buffer_alloc(audio_buf_size);
 			if (IS_ERR(audio->copy_buf))
@@ -677,6 +676,7 @@ f_audio_bind(struct usb_configuration *c, struct usb_function *f)
 	if (!ep)
 		goto fail;
 	audio->out_ep = ep;
+	audio->out_ep->desc = &as_out_ep_desc;
 	ep->driver_data = cdev;	/* claim */
 
 	status = -ENOMEM;
@@ -776,7 +776,6 @@ int __init audio_bind_config(struct usb_configuration *c)
 	audio->card.func.set_alt = f_audio_set_alt;
 	audio->card.func.setup = f_audio_setup;
 	audio->card.func.disable = f_audio_disable;
-	audio->out_desc = &as_out_ep_desc;
 
 	control_selector_init(audio);
 
diff --git a/drivers/usb/gadget/f_ecm.c b/drivers/usb/gadget/f_ecm.c
index 544257a89ed..7c996f271cc 100644
--- a/drivers/usb/gadget/f_ecm.c
+++ b/drivers/usb/gadget/f_ecm.c
@@ -68,7 +68,6 @@ struct f_ecm {
 	struct ecm_ep_descs		hs;
 
 	struct usb_ep			*notify;
-	struct usb_endpoint_descriptor	*notify_desc;
 	struct usb_request		*notify_req;
 	u8				notify_state;
 	bool				is_open;
@@ -466,11 +465,11 @@ static int ecm_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 			usb_ep_disable(ecm->notify);
 		} else {
 			VDBG(cdev, "init ecm ctrl %d\n", intf);
-			ecm->notify_desc = ep_choose(cdev->gadget,
+			ecm->notify->desc = ep_choose(cdev->gadget,
 					ecm->hs.notify,
 					ecm->fs.notify);
 		}
-		usb_ep_enable(ecm->notify, ecm->notify_desc);
+		usb_ep_enable(ecm->notify);
 		ecm->notify->driver_data = ecm;
 
 	/* Data interface has two altsettings, 0 and 1 */
@@ -483,11 +482,11 @@ static int ecm_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 			gether_disconnect(&ecm->port);
 		}
 
-		if (!ecm->port.in) {
+		if (!ecm->port.in_ep->desc) {
 			DBG(cdev, "init ecm\n");
-			ecm->port.in = ep_choose(cdev->gadget,
+			ecm->port.in_ep->desc = ep_choose(cdev->gadget,
 					ecm->hs.in, ecm->fs.in);
-			ecm->port.out = ep_choose(cdev->gadget,
+			ecm->port.out_ep->desc = ep_choose(cdev->gadget,
 					ecm->hs.out, ecm->fs.out);
 		}
 
@@ -549,7 +548,7 @@ static void ecm_disable(struct usb_function *f)
 	if (ecm->notify->driver_data) {
 		usb_ep_disable(ecm->notify);
 		ecm->notify->driver_data = NULL;
-		ecm->notify_desc = NULL;
+		ecm->notify->desc = NULL;
 	}
 }
 
@@ -723,9 +722,9 @@ fail:
 	/* we might as well release our claims on endpoints */
 	if (ecm->notify)
 		ecm->notify->driver_data = NULL;
-	if (ecm->port.out)
+	if (ecm->port.out_ep->desc)
 		ecm->port.out_ep->driver_data = NULL;
-	if (ecm->port.in)
+	if (ecm->port.in_ep->desc)
 		ecm->port.in_ep->driver_data = NULL;
 
 	ERROR(cdev, "%s: can't bind, err %d\n", f->name, status);
diff --git a/drivers/usb/gadget/f_eem.c b/drivers/usb/gadget/f_eem.c
index b3c30429015..fea8e3b08b5 100644
--- a/drivers/usb/gadget/f_eem.c
+++ b/drivers/usb/gadget/f_eem.c
@@ -176,11 +176,11 @@ static int eem_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 			gether_disconnect(&eem->port);
 		}
 
-		if (!eem->port.in) {
+		if (!eem->port.in_ep->desc) {
 			DBG(cdev, "init eem\n");
-			eem->port.in = ep_choose(cdev->gadget,
+			eem->port.in_ep->desc = ep_choose(cdev->gadget,
 					eem->hs.in, eem->fs.in);
-			eem->port.out = ep_choose(cdev->gadget,
+			eem->port.out_ep->desc = ep_choose(cdev->gadget,
 					eem->hs.out, eem->fs.out);
 		}
 
@@ -289,9 +289,9 @@ fail:
 		usb_free_descriptors(f->descriptors);
 
 	/* we might as well release our claims on endpoints */
-	if (eem->port.out)
+	if (eem->port.out_ep->desc)
 		eem->port.out_ep->driver_data = NULL;
-	if (eem->port.in)
+	if (eem->port.in_ep->desc)
 		eem->port.in_ep->driver_data = NULL;
 
 	ERROR(cdev, "%s: can't bind, err %d\n", f->name, status);
diff --git a/drivers/usb/gadget/f_fs.c b/drivers/usb/gadget/f_fs.c
index 19fffccc370..c161a9aaeb7 100644
--- a/drivers/usb/gadget/f_fs.c
+++ b/drivers/usb/gadget/f_fs.c
@@ -1544,7 +1544,8 @@ static int ffs_func_eps_enable(struct ffs_function *func)
 		ds = ep->descs[ep->descs[1] ? 1 : 0];
 
 		ep->ep->driver_data = ep;
-		ret = usb_ep_enable(ep->ep, ds);
+		ep->ep->desc = ds;
+		ret = usb_ep_enable(ep->ep);
 		if (likely(!ret)) {
 			epfile->ep = ep;
 			epfile->in = usb_endpoint_dir_in(ds);
diff --git a/drivers/usb/gadget/f_hid.c b/drivers/usb/gadget/f_hid.c
index 598e7e2ab80..12879b6f787 100644
--- a/drivers/usb/gadget/f_hid.c
+++ b/drivers/usb/gadget/f_hid.c
@@ -416,7 +416,6 @@ static int hidg_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 {
 	struct usb_composite_dev		*cdev = f->config->cdev;
 	struct f_hidg				*hidg = func_to_hidg(f);
-	const struct usb_endpoint_descriptor	*ep_desc;
 	int status = 0;
 
 	VDBG(cdev, "hidg_set_alt intf:%d alt:%d\n", intf, alt);
@@ -426,9 +425,9 @@ static int hidg_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 		if (hidg->in_ep->driver_data != NULL)
 			usb_ep_disable(hidg->in_ep);
 
-		ep_desc = ep_choose(f->config->cdev->gadget,
+		hidg->in_ep->desc = ep_choose(f->config->cdev->gadget,
 				hidg->hs_in_ep_desc, hidg->fs_in_ep_desc);
-		status = usb_ep_enable(hidg->in_ep, ep_desc);
+		status = usb_ep_enable(hidg->in_ep);
 		if (status < 0) {
 			ERROR(cdev, "Enable endpoint FAILED!\n");
 			goto fail;
diff --git a/drivers/usb/gadget/f_loopback.c b/drivers/usb/gadget/f_loopback.c
index b37960f9e75..34e3ccaf088 100644
--- a/drivers/usb/gadget/f_loopback.c
+++ b/drivers/usb/gadget/f_loopback.c
@@ -250,26 +250,24 @@ static int
 enable_loopback(struct usb_composite_dev *cdev, struct f_loopback *loop)
 {
 	int					result = 0;
-	const struct usb_endpoint_descriptor	*src, *sink;
 	struct usb_ep				*ep;
 	struct usb_request			*req;
 	unsigned				i;
 
-	src = ep_choose(cdev->gadget,
-			&hs_loop_source_desc, &fs_loop_source_desc);
-	sink = ep_choose(cdev->gadget,
-			&hs_loop_sink_desc, &fs_loop_sink_desc);
-
 	/* one endpoint writes data back IN to the host */
 	ep = loop->in_ep;
-	result = usb_ep_enable(ep, src);
+	ep->desc = ep_choose(cdev->gadget,
+			&hs_loop_source_desc, &fs_loop_source_desc);
+	result = usb_ep_enable(ep);
 	if (result < 0)
 		return result;
 	ep->driver_data = loop;
 
 	/* one endpoint just reads OUT packets */
 	ep = loop->out_ep;
-	result = usb_ep_enable(ep, sink);
+	ep->desc = ep_choose(cdev->gadget,
+			&hs_loop_sink_desc, &fs_loop_sink_desc);
+	result = usb_ep_enable(ep);
 	if (result < 0) {
 fail0:
 		ep = loop->in_ep;
diff --git a/drivers/usb/gadget/f_mass_storage.c b/drivers/usb/gadget/f_mass_storage.c
index efb58f9f5aa..4eee4341212 100644
--- a/drivers/usb/gadget/f_mass_storage.c
+++ b/drivers/usb/gadget/f_mass_storage.c
@@ -2330,7 +2330,8 @@ static int enable_endpoint(struct fsg_common *common, struct usb_ep *ep,
 	int	rc;
 
 	ep->driver_data = common;
-	rc = usb_ep_enable(ep, d);
+	ep->desc = (struct usb_endpoint_descriptor *)d;
+	rc = usb_ep_enable(ep);
 	if (rc)
 		ERROR(common, "can't enable %s, result %d\n", ep->name, rc);
 	return rc;
diff --git a/drivers/usb/gadget/f_ncm.c b/drivers/usb/gadget/f_ncm.c
index 86902a60bcd..06daa1bc9ff 100644
--- a/drivers/usb/gadget/f_ncm.c
+++ b/drivers/usb/gadget/f_ncm.c
@@ -70,7 +70,6 @@ struct f_ncm {
 	struct ncm_ep_descs		hs;
 
 	struct usb_ep			*notify;
-	struct usb_endpoint_descriptor	*notify_desc;
 	struct usb_request		*notify_req;
 	u8				notify_state;
 	bool				is_open;
@@ -804,11 +803,11 @@ static int ncm_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 			usb_ep_disable(ncm->notify);
 		} else {
 			DBG(cdev, "init ncm ctrl %d\n", intf);
-			ncm->notify_desc = ep_choose(cdev->gadget,
+			ncm->notify->desc = ep_choose(cdev->gadget,
 					ncm->hs.notify,
 					ncm->fs.notify);
 		}
-		usb_ep_enable(ncm->notify, ncm->notify_desc);
+		usb_ep_enable(ncm->notify);
 		ncm->notify->driver_data = ncm;
 
 	/* Data interface has two altsettings, 0 and 1 */
@@ -829,12 +828,12 @@ static int ncm_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 		if (alt == 1) {
 			struct net_device	*net;
 
-			if (!ncm->port.in) {
+			if (!ncm->port.in_ep->desc) {
 				DBG(cdev, "init ncm\n");
-				ncm->port.in = ep_choose(cdev->gadget,
+				ncm->port.in_ep->desc = ep_choose(cdev->gadget,
 							 ncm->hs.in,
 							 ncm->fs.in);
-				ncm->port.out = ep_choose(cdev->gadget,
+				ncm->port.out_ep->desc = ep_choose(cdev->gadget,
 							  ncm->hs.out,
 							  ncm->fs.out);
 			}
@@ -1111,7 +1110,7 @@ static void ncm_disable(struct usb_function *f)
 	if (ncm->notify->driver_data) {
 		usb_ep_disable(ncm->notify);
 		ncm->notify->driver_data = NULL;
-		ncm->notify_desc = NULL;
+		ncm->notify->desc = NULL;
 	}
 }
 
@@ -1288,9 +1287,9 @@ fail:
 	/* we might as well release our claims on endpoints */
 	if (ncm->notify)
 		ncm->notify->driver_data = NULL;
-	if (ncm->port.out)
+	if (ncm->port.out_ep->desc)
 		ncm->port.out_ep->driver_data = NULL;
-	if (ncm->port.in)
+	if (ncm->port.in_ep->desc)
 		ncm->port.in_ep->driver_data = NULL;
 
 	ERROR(cdev, "%s: can't bind, err %d\n", f->name, status);
diff --git a/drivers/usb/gadget/f_obex.c b/drivers/usb/gadget/f_obex.c
index 8f8c6437147..a6dbda090ca 100644
--- a/drivers/usb/gadget/f_obex.c
+++ b/drivers/usb/gadget/f_obex.c
@@ -227,11 +227,11 @@ static int obex_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 			gserial_disconnect(&obex->port);
 		}
 
-		if (!obex->port.in_desc) {
+		if (!obex->port.in->desc) {
 			DBG(cdev, "init obex ttyGS%d\n", obex->port_num);
-			obex->port.in_desc = ep_choose(cdev->gadget,
+			obex->port.in->desc = ep_choose(cdev->gadget,
 					obex->hs.obex_in, obex->fs.obex_in);
-			obex->port.out_desc = ep_choose(cdev->gadget,
+			obex->port.out->desc = ep_choose(cdev->gadget,
 					obex->hs.obex_out, obex->fs.obex_out);
 		}
 
diff --git a/drivers/usb/gadget/f_phonet.c b/drivers/usb/gadget/f_phonet.c
index 5e1495097ec..dc63f161a10 100644
--- a/drivers/usb/gadget/f_phonet.c
+++ b/drivers/usb/gadget/f_phonet.c
@@ -427,17 +427,16 @@ static int pn_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 		spin_lock(&port->lock);
 		__pn_reset(f);
 		if (alt == 1) {
-			struct usb_endpoint_descriptor *out, *in;
 			int i;
 
-			out = ep_choose(gadget,
+			fp->out_ep->desc = ep_choose(gadget,
 					&pn_hs_sink_desc,
 					&pn_fs_sink_desc);
-			in = ep_choose(gadget,
+			fp->in_ep->desc = ep_choose(gadget,
 					&pn_hs_source_desc,
 					&pn_fs_source_desc);
-			usb_ep_enable(fp->out_ep, out);
-			usb_ep_enable(fp->in_ep, in);
+			usb_ep_enable(fp->out_ep);
+			usb_ep_enable(fp->in_ep);
 
 			port->usb = fp;
 			fp->out_ep->driver_data = fp;
diff --git a/drivers/usb/gadget/f_rndis.c b/drivers/usb/gadget/f_rndis.c
index fa12ec8364e..4646254a892 100644
--- a/drivers/usb/gadget/f_rndis.c
+++ b/drivers/usb/gadget/f_rndis.c
@@ -92,7 +92,6 @@ struct f_rndis {
 	struct rndis_ep_descs		hs;
 
 	struct usb_ep			*notify;
-	struct usb_endpoint_descriptor	*notify_desc;
 	struct usb_request		*notify_req;
 	atomic_t			notify_count;
 };
@@ -486,11 +485,11 @@ static int rndis_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 			usb_ep_disable(rndis->notify);
 		} else {
 			VDBG(cdev, "init rndis ctrl %d\n", intf);
-			rndis->notify_desc = ep_choose(cdev->gadget,
+			rndis->notify->desc = ep_choose(cdev->gadget,
 					rndis->hs.notify,
 					rndis->fs.notify);
 		}
-		usb_ep_enable(rndis->notify, rndis->notify_desc);
+		usb_ep_enable(rndis->notify);
 		rndis->notify->driver_data = rndis;
 
 	} else if (intf == rndis->data_id) {
@@ -501,11 +500,11 @@ static int rndis_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 			gether_disconnect(&rndis->port);
 		}
 
-		if (!rndis->port.in) {
+		if (!rndis->port.in_ep->desc) {
 			DBG(cdev, "init rndis\n");
-			rndis->port.in = ep_choose(cdev->gadget,
+			rndis->port.in_ep->desc = ep_choose(cdev->gadget,
 					rndis->hs.in, rndis->fs.in);
-			rndis->port.out = ep_choose(cdev->gadget,
+			rndis->port.out_ep->desc = ep_choose(cdev->gadget,
 					rndis->hs.out, rndis->fs.out);
 		}
 
@@ -738,9 +737,9 @@ fail:
 	/* we might as well release our claims on endpoints */
 	if (rndis->notify)
 		rndis->notify->driver_data = NULL;
-	if (rndis->port.out)
+	if (rndis->port.out_ep->desc)
 		rndis->port.out_ep->driver_data = NULL;
-	if (rndis->port.in)
+	if (rndis->port.in_ep->desc)
 		rndis->port.in_ep->driver_data = NULL;
 
 	ERROR(cdev, "%s: can't bind, err %d\n", f->name, status);
diff --git a/drivers/usb/gadget/f_serial.c b/drivers/usb/gadget/f_serial.c
index 490b00b01a7..a9ce6261d15 100644
--- a/drivers/usb/gadget/f_serial.c
+++ b/drivers/usb/gadget/f_serial.c
@@ -138,9 +138,9 @@ static int gser_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 		gserial_disconnect(&gser->port);
 	} else {
 		DBG(cdev, "activate generic ttyGS%d\n", gser->port_num);
-		gser->port.in_desc = ep_choose(cdev->gadget,
+		gser->port.in->desc = ep_choose(cdev->gadget,
 				gser->hs.in, gser->fs.in);
-		gser->port.out_desc = ep_choose(cdev->gadget,
+		gser->port.out->desc = ep_choose(cdev->gadget,
 				gser->hs.out, gser->fs.out);
 	}
 	gserial_connect(&gser->port, gser->port_num);
diff --git a/drivers/usb/gadget/f_sourcesink.c b/drivers/usb/gadget/f_sourcesink.c
index e403a534dd5..0ffddd33a55 100644
--- a/drivers/usb/gadget/f_sourcesink.c
+++ b/drivers/usb/gadget/f_sourcesink.c
@@ -343,15 +343,12 @@ static int
 enable_source_sink(struct usb_composite_dev *cdev, struct f_sourcesink *ss)
 {
 	int					result = 0;
-	const struct usb_endpoint_descriptor	*src, *sink;
 	struct usb_ep				*ep;
 
-	src = ep_choose(cdev->gadget, &hs_source_desc, &fs_source_desc);
-	sink = ep_choose(cdev->gadget, &hs_sink_desc, &fs_sink_desc);
-
 	/* one endpoint writes (sources) zeroes IN (to the host) */
 	ep = ss->in_ep;
-	result = usb_ep_enable(ep, src);
+	ep->desc = ep_choose(cdev->gadget, &hs_source_desc, &fs_source_desc);
+	result = usb_ep_enable(ep);
 	if (result < 0)
 		return result;
 	ep->driver_data = ss;
@@ -367,7 +364,8 @@ fail:
 
 	/* one endpoint reads (sinks) anything OUT (from the host) */
 	ep = ss->out_ep;
-	result = usb_ep_enable(ep, sink);
+	ep->desc = ep_choose(cdev->gadget, &hs_sink_desc, &fs_sink_desc);
+	result = usb_ep_enable(ep);
 	if (result < 0)
 		goto fail;
 	ep->driver_data = ss;
diff --git a/drivers/usb/gadget/f_subset.c b/drivers/usb/gadget/f_subset.c
index 8675ca41532..aecaed1724a 100644
--- a/drivers/usb/gadget/f_subset.c
+++ b/drivers/usb/gadget/f_subset.c
@@ -243,9 +243,9 @@ static int geth_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 	}
 
 	DBG(cdev, "init + activate cdc subset\n");
-	geth->port.in = ep_choose(cdev->gadget,
+	geth->port.in_ep->desc = ep_choose(cdev->gadget,
 			geth->hs.in, geth->fs.in);
-	geth->port.out = ep_choose(cdev->gadget,
+	geth->port.out_ep->desc = ep_choose(cdev->gadget,
 			geth->hs.out, geth->fs.out);
 
 	net = gether_connect(&geth->port);
@@ -334,9 +334,9 @@ geth_bind(struct usb_configuration *c, struct usb_function *f)
 
 fail:
 	/* we might as well release our claims on endpoints */
-	if (geth->port.out)
+	if (geth->port.out_ep->desc)
 		geth->port.out_ep->driver_data = NULL;
-	if (geth->port.in)
+	if (geth->port.in_ep->desc)
 		geth->port.in_ep->driver_data = NULL;
 
 	ERROR(cdev, "%s: can't bind, err %d\n", f->name, status);
diff --git a/drivers/usb/gadget/f_uvc.c b/drivers/usb/gadget/f_uvc.c
index be446b7e7ea..df74d031191 100644
--- a/drivers/usb/gadget/f_uvc.c
+++ b/drivers/usb/gadget/f_uvc.c
@@ -262,8 +262,10 @@ uvc_function_set_alt(struct usb_function *f, unsigned interface, unsigned alt)
 		if (uvc->state != UVC_STATE_CONNECTED)
 			return 0;
 
-		if (uvc->video.ep)
-			usb_ep_enable(uvc->video.ep, &uvc_streaming_ep);
+		if (uvc->video.ep) {
+			uvc->video.ep->desc = &uvc_streaming_ep;
+			usb_ep_enable(uvc->video.ep);
+		}
 
 		memset(&v4l2_event, 0, sizeof(v4l2_event));
 		v4l2_event.type = UVC_EVENT_STREAMON;
diff --git a/drivers/usb/gadget/file_storage.c b/drivers/usb/gadget/file_storage.c
index 83bee30cdb9..738591a64bb 100644
--- a/drivers/usb/gadget/file_storage.c
+++ b/drivers/usb/gadget/file_storage.c
@@ -2713,7 +2713,8 @@ static int enable_endpoint(struct fsg_dev *fsg, struct usb_ep *ep,
 	int	rc;
 
 	ep->driver_data = fsg;
-	rc = usb_ep_enable(ep, d);
+	ep->desc = d;
+	rc = usb_ep_enable(ep);
 	if (rc)
 		ERROR(fsg, "can't enable %s, result %d\n", ep->name, rc);
 	return rc;
diff --git a/drivers/usb/gadget/gmidi.c b/drivers/usb/gadget/gmidi.c
index 47b86b99d44..4f40f146743 100644
--- a/drivers/usb/gadget/gmidi.c
+++ b/drivers/usb/gadget/gmidi.c
@@ -537,14 +537,16 @@ static int set_gmidi_config(struct gmidi_device *dev, gfp_t gfp_flags)
 	struct usb_ep *ep;
 	unsigned i;
 
-	err = usb_ep_enable(dev->in_ep, &bulk_in_desc);
+	dev->in_ep->desc = &bulk_in_desc;
+	err = usb_ep_enable(dev->in_ep);
 	if (err) {
 		ERROR(dev, "can't start %s: %d\n", dev->in_ep->name, err);
 		goto fail;
 	}
 	dev->in_ep->driver_data = dev;
 
-	err = usb_ep_enable(dev->out_ep, &bulk_out_desc);
+	dev->out_ep->desc = &bulk_out_desc;
+	err = usb_ep_enable(dev->out_ep);
 	if (err) {
 		ERROR(dev, "can't start %s: %d\n", dev->out_ep->name, err);
 		goto fail;
diff --git a/drivers/usb/gadget/inode.c b/drivers/usb/gadget/inode.c
index a56876aaf76..a9a45569239 100644
--- a/drivers/usb/gadget/inode.c
+++ b/drivers/usb/gadget/inode.c
@@ -832,14 +832,16 @@ ep_config (struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
 	switch (data->dev->gadget->speed) {
 	case USB_SPEED_LOW:
 	case USB_SPEED_FULL:
-		value = usb_ep_enable (ep, &data->desc);
+		ep->desc = &data->desc;
+		value = usb_ep_enable(ep);
 		if (value == 0)
 			data->state = STATE_EP_ENABLED;
 		break;
 #ifdef	CONFIG_USB_GADGET_DUALSPEED
 	case USB_SPEED_HIGH:
 		/* fails if caller didn't provide that descriptor... */
-		value = usb_ep_enable (ep, &data->hs_desc);
+		ep->desc = &data->hs_desc;
+		value = usb_ep_enable(ep);
 		if (value == 0)
 			data->state = STATE_EP_ENABLED;
 		break;
diff --git a/drivers/usb/gadget/printer.c b/drivers/usb/gadget/printer.c
index 271ef94668e..00e5f19c75b 100644
--- a/drivers/usb/gadget/printer.c
+++ b/drivers/usb/gadget/printer.c
@@ -89,8 +89,7 @@ struct printer_dev {
 	u8			config;
 	s8			interface;
 	struct usb_ep		*in_ep, *out_ep;
-	const struct usb_endpoint_descriptor
-				*in, *out;
+
 	struct list_head	rx_reqs;	/* List of free RX structs */
 	struct list_head	rx_reqs_active;	/* List of Active RX xfers */
 	struct list_head	rx_buffers;	/* List of completed xfers */
@@ -895,19 +894,20 @@ set_printer_interface(struct printer_dev *dev)
 {
 	int			result = 0;
 
-	dev->in = ep_desc(dev->gadget, &hs_ep_in_desc, &fs_ep_in_desc);
+	dev->in_ep->desc = ep_desc(dev->gadget, &hs_ep_in_desc, &fs_ep_in_desc);
 	dev->in_ep->driver_data = dev;
 
-	dev->out = ep_desc(dev->gadget, &hs_ep_out_desc, &fs_ep_out_desc);
+	dev->out_ep->desc = ep_desc(dev->gadget, &hs_ep_out_desc,
+				    &fs_ep_out_desc);
 	dev->out_ep->driver_data = dev;
 
-	result = usb_ep_enable(dev->in_ep, dev->in);
+	result = usb_ep_enable(dev->in_ep);
 	if (result != 0) {
 		DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result);
 		goto done;
 	}
 
-	result = usb_ep_enable(dev->out_ep, dev->out);
+	result = usb_ep_enable(dev->out_ep);
 	if (result != 0) {
 		DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result);
 		goto done;
@@ -918,8 +918,8 @@ done:
 	if (result != 0) {
 		(void) usb_ep_disable(dev->in_ep);
 		(void) usb_ep_disable(dev->out_ep);
-		dev->in = NULL;
-		dev->out = NULL;
+		dev->in_ep->desc = NULL;
+		dev->out_ep->desc = NULL;
 	}
 
 	/* caller is responsible for cleanup on error */
@@ -933,12 +933,14 @@ static void printer_reset_interface(struct printer_dev *dev)
 
 	DBG(dev, "%s\n", __func__);
 
-	if (dev->in)
+	if (dev->in_ep->desc)
 		usb_ep_disable(dev->in_ep);
 
-	if (dev->out)
+	if (dev->out_ep->desc)
 		usb_ep_disable(dev->out_ep);
 
+	dev->in_ep->desc = NULL;
+	dev->out_ep->desc = NULL;
 	dev->interface = -1;
 }
 
@@ -1104,9 +1106,9 @@ static void printer_soft_reset(struct printer_dev *dev)
 		list_add(&req->list, &dev->tx_reqs);
 	}
 
-	if (usb_ep_enable(dev->in_ep, dev->in))
+	if (usb_ep_enable(dev->in_ep))
 		DBG(dev, "Failed to enable USB in_ep\n");
-	if (usb_ep_enable(dev->out_ep, dev->out))
+	if (usb_ep_enable(dev->out_ep))
 		DBG(dev, "Failed to enable USB out_ep\n");
 
 	wake_up_interruptible(&dev->rx_wait);
diff --git a/drivers/usb/gadget/u_ether.c b/drivers/usb/gadget/u_ether.c
index 2ac1d214732..b91363e88db 100644
--- a/drivers/usb/gadget/u_ether.c
+++ b/drivers/usb/gadget/u_ether.c
@@ -693,8 +693,8 @@ static int eth_stop(struct net_device *net)
 		usb_ep_disable(link->out_ep);
 		if (netif_carrier_ok(net)) {
 			DBG(dev, "host still using in/out endpoints\n");
-			usb_ep_enable(link->in_ep, link->in);
-			usb_ep_enable(link->out_ep, link->out);
+			usb_ep_enable(link->in_ep);
+			usb_ep_enable(link->out_ep);
 		}
 	}
 	spin_unlock_irqrestore(&dev->lock, flags);
@@ -871,7 +871,7 @@ struct net_device *gether_connect(struct gether *link)
 		return ERR_PTR(-EINVAL);
 
 	link->in_ep->driver_data = dev;
-	result = usb_ep_enable(link->in_ep, link->in);
+	result = usb_ep_enable(link->in_ep);
 	if (result != 0) {
 		DBG(dev, "enable %s --> %d\n",
 			link->in_ep->name, result);
@@ -879,7 +879,7 @@ struct net_device *gether_connect(struct gether *link)
 	}
 
 	link->out_ep->driver_data = dev;
-	result = usb_ep_enable(link->out_ep, link->out);
+	result = usb_ep_enable(link->out_ep);
 	if (result != 0) {
 		DBG(dev, "enable %s --> %d\n",
 			link->out_ep->name, result);
@@ -969,7 +969,7 @@ void gether_disconnect(struct gether *link)
 	}
 	spin_unlock(&dev->req_lock);
 	link->in_ep->driver_data = NULL;
-	link->in = NULL;
+	link->in_ep->desc = NULL;
 
 	usb_ep_disable(link->out_ep);
 	spin_lock(&dev->req_lock);
@@ -984,7 +984,7 @@ void gether_disconnect(struct gether *link)
 	}
 	spin_unlock(&dev->req_lock);
 	link->out_ep->driver_data = NULL;
-	link->out = NULL;
+	link->out_ep->desc = NULL;
 
 	/* finish forgetting about this USB link episode */
 	dev->header_len = 0;
diff --git a/drivers/usb/gadget/u_ether.h b/drivers/usb/gadget/u_ether.h
index b56e1e7d423..c966440ddd7 100644
--- a/drivers/usb/gadget/u_ether.h
+++ b/drivers/usb/gadget/u_ether.h
@@ -52,10 +52,6 @@ struct gether {
 	struct usb_ep			*in_ep;
 	struct usb_ep			*out_ep;
 
-	/* descriptors match device speed at gether_connect() time */
-	struct usb_endpoint_descriptor	*in;
-	struct usb_endpoint_descriptor	*out;
-
 	bool				is_zlp_ok;
 
 	u16				cdc_filter;
diff --git a/drivers/usb/gadget/u_serial.c b/drivers/usb/gadget/u_serial.c
index 40f7716b31f..a8aa46962d8 100644
--- a/drivers/usb/gadget/u_serial.c
+++ b/drivers/usb/gadget/u_serial.c
@@ -1247,12 +1247,12 @@ int gserial_connect(struct gserial *gser, u8 port_num)
 	port = ports[port_num].port;
 
 	/* activate the endpoints */
-	status = usb_ep_enable(gser->in, gser->in_desc);
+	status = usb_ep_enable(gser->in);
 	if (status < 0)
 		return status;
 	gser->in->driver_data = port;
 
-	status = usb_ep_enable(gser->out, gser->out_desc);
+	status = usb_ep_enable(gser->out);
 	if (status < 0)
 		goto fail_out;
 	gser->out->driver_data = port;
diff --git a/drivers/usb/gadget/u_serial.h b/drivers/usb/gadget/u_serial.h
index 300f0ed9475..9b0fe6450fb 100644
--- a/drivers/usb/gadget/u_serial.h
+++ b/drivers/usb/gadget/u_serial.h
@@ -35,8 +35,6 @@ struct gserial {
 
 	struct usb_ep			*in;
 	struct usb_ep			*out;
-	struct usb_endpoint_descriptor	*in_desc;
-	struct usb_endpoint_descriptor	*out_desc;
 
 	/* REVISIT avoid this CDC-ACM support harder ... */
 	struct usb_cdc_line_coding port_line_coding;	/* 9600-8-N-1 etc */
diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
index 18979cfb6d6..fe50912585f 100644
--- a/include/linux/usb/gadget.h
+++ b/include/linux/usb/gadget.h
@@ -132,8 +132,9 @@ struct usb_ep_ops {
  * @maxpacket:The maximum packet size used on this endpoint.  The initial
  *	value can sometimes be reduced (hardware allowing), according to
  *      the endpoint descriptor used to configure the endpoint.
- * @driver_data:for use by the gadget driver.  all other fields are
- *	read-only to gadget drivers.
+ * @driver_data:for use by the gadget driver.
+ * @desc: endpoint descriptor.  This pointer is set before the endpoint is
+ *	enabled and remains valid until the endpoint is disabled.
  *
  * the bus controller driver lists all the general purpose endpoints in
  * gadget->ep_list.  the control endpoint (gadget->ep0) is not in that list,
@@ -146,6 +147,7 @@ struct usb_ep {
 	const struct usb_ep_ops	*ops;
 	struct list_head	ep_list;
 	unsigned		maxpacket:16;
+	const struct usb_endpoint_descriptor	*desc;
 };
 
 /*-------------------------------------------------------------------------*/
@@ -154,11 +156,8 @@ struct usb_ep {
  * usb_ep_enable - configure endpoint, making it usable
  * @ep:the endpoint being configured.  may not be the endpoint named "ep0".
  *	drivers discover endpoints through the ep_list of a usb_gadget.
- * @desc:descriptor for desired behavior.  caller guarantees this pointer
- *	remains valid until the endpoint is disabled; the data byte order
- *	is little-endian (usb-standard).
  *
- * when configurations are set, or when interface settings change, the driver
+ * When configurations are set, or when interface settings change, the driver
  * will enable or disable the relevant endpoints.  while it is enabled, an
  * endpoint may be used for i/o until the driver receives a disconnect() from
  * the host or until the endpoint is disabled.
@@ -173,10 +172,9 @@ struct usb_ep {
  *
  * returns zero, or a negative error code.
  */
-static inline int usb_ep_enable(struct usb_ep *ep,
-				const struct usb_endpoint_descriptor *desc)
+static inline int usb_ep_enable(struct usb_ep *ep)
 {
-	return ep->ops->enable(ep, desc);
+	return ep->ops->enable(ep, ep->desc);
 }
 
 /**