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path: root/drivers/usb/host/uhci-q.c
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Diffstat (limited to 'drivers/usb/host/uhci-q.c')
-rw-r--r--drivers/usb/host/uhci-q.c138
1 files changed, 77 insertions, 61 deletions
diff --git a/drivers/usb/host/uhci-q.c b/drivers/usb/host/uhci-q.c
index b1b551a3d14..c4194182dcc 100644
--- a/drivers/usb/host/uhci-q.c
+++ b/drivers/usb/host/uhci-q.c
@@ -48,10 +48,6 @@ static struct uhci_td *uhci_alloc_td(struct uhci_hcd *uhci)
return NULL;
td->dma_handle = dma_handle;
-
- td->link = UHCI_PTR_TERM;
- td->buffer = 0;
-
td->frame = -1;
INIT_LIST_HEAD(&td->list);
@@ -221,6 +217,11 @@ static struct uhci_qh *uhci_alloc_qh(struct uhci_hcd *uhci,
INIT_LIST_HEAD(&qh->node);
if (udev) { /* Normal QH */
+ qh->dummy_td = uhci_alloc_td(uhci);
+ if (!qh->dummy_td) {
+ dma_pool_free(uhci->qh_pool, qh, dma_handle);
+ return NULL;
+ }
qh->state = QH_STATE_IDLE;
qh->hep = hep;
qh->udev = udev;
@@ -244,6 +245,7 @@ static void uhci_free_qh(struct uhci_hcd *uhci, struct uhci_qh *qh)
if (qh->udev) {
qh->hep->hcpriv = NULL;
usb_put_dev(qh->udev);
+ uhci_free_td(uhci, qh->dummy_td);
}
dma_pool_free(uhci->qh_pool, qh, qh->dma_handle);
}
@@ -531,22 +533,20 @@ static int uhci_submit_control(struct uhci_hcd *uhci, struct urb *urb,
/* The "pipe" thing contains the destination in bits 8--18 */
destination = (urb->pipe & PIPE_DEVEP_MASK) | USB_PID_SETUP;
- /* 3 errors */
- status = TD_CTRL_ACTIVE | uhci_maxerr(3);
+ /* 3 errors, dummy TD remains inactive */
+ status = uhci_maxerr(3);
if (urb->dev->speed == USB_SPEED_LOW)
status |= TD_CTRL_LS;
/*
* Build the TD for the control request setup packet
*/
- td = uhci_alloc_td(uhci);
- if (!td)
- return -ENOMEM;
-
+ td = qh->dummy_td;
uhci_add_td_to_urb(urb, td);
uhci_fill_td(td, status, destination | uhci_explen(8),
urb->setup_dma);
plink = &td->link;
+ status |= TD_CTRL_ACTIVE;
/*
* If direction is "send", change the packet ID from SETUP (0x2D)
@@ -568,7 +568,7 @@ static int uhci_submit_control(struct uhci_hcd *uhci, struct urb *urb,
td = uhci_alloc_td(uhci);
if (!td)
- return -ENOMEM;
+ goto nomem;
*plink = cpu_to_le32(td->dma_handle);
/* Alternate Data0/1 (start with Data1) */
@@ -588,7 +588,7 @@ static int uhci_submit_control(struct uhci_hcd *uhci, struct urb *urb,
*/
td = uhci_alloc_td(uhci);
if (!td)
- return -ENOMEM;
+ goto nomem;
*plink = cpu_to_le32(td->dma_handle);
/*
@@ -608,6 +608,20 @@ static int uhci_submit_control(struct uhci_hcd *uhci, struct urb *urb,
uhci_add_td_to_urb(urb, td);
uhci_fill_td(td, status | TD_CTRL_IOC,
destination | uhci_explen(0), 0);
+ plink = &td->link;
+
+ /*
+ * Build the new dummy TD and activate the old one
+ */
+ td = uhci_alloc_td(uhci);
+ if (!td)
+ goto nomem;
+ *plink = cpu_to_le32(td->dma_handle);
+
+ uhci_fill_td(td, 0, USB_PID_OUT | uhci_explen(0), 0);
+ wmb();
+ qh->dummy_td->status |= __constant_cpu_to_le32(TD_CTRL_ACTIVE);
+ qh->dummy_td = td;
/* Low-speed transfers get a different queue, and won't hog the bus.
* Also, some devices enumerate better without FSBR; the easiest way
@@ -620,8 +634,12 @@ static int uhci_submit_control(struct uhci_hcd *uhci, struct urb *urb,
qh->skel = uhci->skel_fs_control_qh;
uhci_inc_fsbr(uhci, urb);
}
-
return 0;
+
+nomem:
+ /* Remove the dummy TD from the td_list so it doesn't get freed */
+ uhci_remove_td_from_urb(qh->dummy_td);
+ return -ENOMEM;
}
/*
@@ -761,16 +779,19 @@ static int uhci_submit_common(struct uhci_hcd *uhci, struct urb *urb,
int maxsze = le16_to_cpu(qh->hep->desc.wMaxPacketSize);
int len = urb->transfer_buffer_length;
dma_addr_t data = urb->transfer_dma;
- __le32 *plink, fake_link;
+ __le32 *plink;
+ unsigned int toggle;
if (len < 0)
return -EINVAL;
/* The "pipe" thing contains the destination in bits 8--18 */
destination = (urb->pipe & PIPE_DEVEP_MASK) | usb_packetid(urb->pipe);
+ toggle = usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe),
+ usb_pipeout(urb->pipe));
- /* 3 errors */
- status = TD_CTRL_ACTIVE | uhci_maxerr(3);
+ /* 3 errors, dummy TD remains inactive */
+ status = uhci_maxerr(3);
if (urb->dev->speed == USB_SPEED_LOW)
status |= TD_CTRL_LS;
if (usb_pipein(urb->pipe))
@@ -779,7 +800,8 @@ static int uhci_submit_common(struct uhci_hcd *uhci, struct urb *urb,
/*
* Build the DATA TDs
*/
- plink = &fake_link;
+ plink = NULL;
+ td = qh->dummy_td;
do { /* Allow zero length packets */
int pktsze = maxsze;
@@ -789,24 +811,23 @@ static int uhci_submit_common(struct uhci_hcd *uhci, struct urb *urb,
status &= ~TD_CTRL_SPD;
}
- td = uhci_alloc_td(uhci);
- if (!td)
- return -ENOMEM;
- *plink = cpu_to_le32(td->dma_handle);
-
+ if (plink) {
+ td = uhci_alloc_td(uhci);
+ if (!td)
+ goto nomem;
+ *plink = cpu_to_le32(td->dma_handle);
+ }
uhci_add_td_to_urb(urb, td);
uhci_fill_td(td, status,
- destination | uhci_explen(pktsze) |
- (usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe),
- usb_pipeout(urb->pipe)) << TD_TOKEN_TOGGLE_SHIFT),
- data);
+ destination | uhci_explen(pktsze) |
+ (toggle << TD_TOKEN_TOGGLE_SHIFT),
+ data);
plink = &td->link;
+ status |= TD_CTRL_ACTIVE;
data += pktsze;
len -= maxsze;
-
- usb_dotoggle(urb->dev, usb_pipeendpoint(urb->pipe),
- usb_pipeout(urb->pipe));
+ toggle ^= 1;
} while (len > 0);
/*
@@ -821,17 +842,17 @@ static int uhci_submit_common(struct uhci_hcd *uhci, struct urb *urb,
urb->transfer_buffer_length > 0) {
td = uhci_alloc_td(uhci);
if (!td)
- return -ENOMEM;
+ goto nomem;
*plink = cpu_to_le32(td->dma_handle);
uhci_add_td_to_urb(urb, td);
- uhci_fill_td(td, status, destination | uhci_explen(0) |
- (usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe),
- usb_pipeout(urb->pipe)) << TD_TOKEN_TOGGLE_SHIFT),
- data);
+ uhci_fill_td(td, status,
+ destination | uhci_explen(0) |
+ (toggle << TD_TOKEN_TOGGLE_SHIFT),
+ data);
+ plink = &td->link;
- usb_dotoggle(urb->dev, usb_pipeendpoint(urb->pipe),
- usb_pipeout(urb->pipe));
+ toggle ^= 1;
}
/* Set the interrupt-on-completion flag on the last packet.
@@ -842,7 +863,27 @@ static int uhci_submit_common(struct uhci_hcd *uhci, struct urb *urb,
* flag setting. */
td->status |= __constant_cpu_to_le32(TD_CTRL_IOC);
+ /*
+ * Build the new dummy TD and activate the old one
+ */
+ td = uhci_alloc_td(uhci);
+ if (!td)
+ goto nomem;
+ *plink = cpu_to_le32(td->dma_handle);
+
+ uhci_fill_td(td, 0, USB_PID_OUT | uhci_explen(0), 0);
+ wmb();
+ qh->dummy_td->status |= __constant_cpu_to_le32(TD_CTRL_ACTIVE);
+ qh->dummy_td = td;
+
+ usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
+ usb_pipeout(urb->pipe), toggle);
return 0;
+
+nomem:
+ /* Remove the dummy TD from the td_list so it doesn't get freed */
+ uhci_remove_td_from_urb(qh->dummy_td);
+ return -ENOMEM;
}
/*
@@ -1169,31 +1210,6 @@ static int uhci_urb_enqueue(struct usb_hcd *hcd,
* become idle, so we can activate it right away. */
if (qh->queue.next == &urbp->node)
uhci_activate_qh(uhci, qh);
-
- /* If the QH is already active, we have a race with the hardware.
- * This won't get fixed until dummy TDs are added. */
- else if (qh->state == QH_STATE_ACTIVE) {
-
- /* If the URB isn't first on its queue, adjust the link pointer
- * of the last TD in the previous URB. */
- if (urbp->node.prev != &urbp->qh->queue) {
- struct urb_priv *purbp = list_entry(urbp->node.prev,
- struct urb_priv, node);
- struct uhci_td *ptd = list_entry(purbp->td_list.prev,
- struct uhci_td, list);
- struct uhci_td *td = list_entry(urbp->td_list.next,
- struct uhci_td, list);
-
- ptd->link = cpu_to_le32(td->dma_handle);
-
- }
- if (qh_element(qh) == UHCI_PTR_TERM) {
- struct uhci_td *td = list_entry(urbp->td_list.next,
- struct uhci_td, list);
-
- qh->element = cpu_to_le32(td->dma_handle);
- }
- }
goto done;
err_submit_failed:
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-22 18:40:27 +0000