Merge tag 'for-usb-next-2014-03-06' of git://git.kernel.org/pub/scm/linux/kernel/git/sarah/xhci into usb-next

Sarah writes:

xhci: Streams and UAS cleanups, misc cleanups for 3.15

Hi Greg,

Here's 76 patches to queue to usb-next for 3.15.

The bulk of this rather large pull request is the UAS driver cleanup, the
xHCI streams fixes, and the new userspace API for usbfs to be able to use
and alloc/free bulk streams.  I've hammered on these changes, and the UAS
driver seems solid.  The performance numbers are pretty spiffy too:

root@xanatos:~# echo 3 > /proc/sys/vm/drop_caches; dd if=/dev/sdb of=/dev/null bs=4k count=1000M iflag=count_bytes
256000+0 records in
256000+0 records out
1048576000 bytes (1.0 GB) copied, 3.28557 s, 319 MB/s

That's about 100 MB/s faster than my fastest Bulk-only-Transport mass
storage drive.

There's a couple of miscellaneous cleanup patches and non-urgent bug fixes
in here as well:

7969943789df xhci: add the meaningful IRQ description if it is empty
bcffae7708eb xhci: Prevent runtime pm from autosuspending during initialization
e587b8b270d3 xhci: make warnings greppable
25cd2882e2fc usb/xhci: Change how we indicate a host supports Link PM.

Sarah Sharp

1 files changed, 27 insertions, 10 deletions

diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 2518c325075..9c4e2922b04 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -2049,7 +2049,7 @@ int usb_alloc_streams(struct usb_interface *interface,
 {
 	struct usb_hcd *hcd;
 	struct usb_device *dev;
-	int i;
+	int i, ret;
 
 	dev = interface_to_usbdev(interface);
 	hcd = bus_to_hcd(dev->bus);
@@ -2058,13 +2058,24 @@ int usb_alloc_streams(struct usb_interface *interface,
 	if (dev->speed != USB_SPEED_SUPER)
 		return -EINVAL;
 
-	/* Streams only apply to bulk endpoints. */
-	for (i = 0; i < num_eps; i++)
+	for (i = 0; i < num_eps; i++) {
+		/* Streams only apply to bulk endpoints. */
 		if (!usb_endpoint_xfer_bulk(&eps[i]->desc))
 			return -EINVAL;
+		/* Re-alloc is not allowed */
+		if (eps[i]->streams)
+			return -EINVAL;
+	}
 
-	return hcd->driver->alloc_streams(hcd, dev, eps, num_eps,
+	ret = hcd->driver->alloc_streams(hcd, dev, eps, num_eps,
 			num_streams, mem_flags);
+	if (ret < 0)
+		return ret;
+
+	for (i = 0; i < num_eps; i++)
+		eps[i]->streams = ret;
+
+	return ret;
 }
 EXPORT_SYMBOL_GPL(usb_alloc_streams);
 
@@ -2078,8 +2089,7 @@ EXPORT_SYMBOL_GPL(usb_alloc_streams);
  * Reverts a group of bulk endpoints back to not using stream IDs.
  * Can fail if we are given bad arguments, or HCD is broken.
  *
- * Return: On success, the number of allocated streams. On failure, a negative
- * error code.
+ * Return: 0 on success. On failure, a negative error code.
  */
 int usb_free_streams(struct usb_interface *interface,
 		struct usb_host_endpoint **eps, unsigned int num_eps,
@@ -2087,19 +2097,26 @@ int usb_free_streams(struct usb_interface *interface,
 {
 	struct usb_hcd *hcd;
 	struct usb_device *dev;
-	int i;
+	int i, ret;
 
 	dev = interface_to_usbdev(interface);
 	hcd = bus_to_hcd(dev->bus);
 	if (dev->speed != USB_SPEED_SUPER)
 		return -EINVAL;
 
-	/* Streams only apply to bulk endpoints. */
+	/* Double-free is not allowed */
 	for (i = 0; i < num_eps; i++)
-		if (!eps[i] || !usb_endpoint_xfer_bulk(&eps[i]->desc))
+		if (!eps[i] || !eps[i]->streams)
 			return -EINVAL;
 
-	return hcd->driver->free_streams(hcd, dev, eps, num_eps, mem_flags);
+	ret = hcd->driver->free_streams(hcd, dev, eps, num_eps, mem_flags);
+	if (ret < 0)
+		return ret;
+
+	for (i = 0; i < num_eps; i++)
+		eps[i]->streams = 0;
+
+	return ret;
 }
 EXPORT_SYMBOL_GPL(usb_free_streams);