USB: allow interrupt transfers to WUSB devices
Check urb->interval on interrupt transfers and allow those with valid
values (6 <= interval <= 16).
Signed-off-by: David Vrabel <david.vrabel@csr.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/core/urb.c b/drivers/usb/core/urb.c
index 0885d4a..e7cae13 100644
--- a/drivers/usb/core/urb.c
+++ b/drivers/usb/core/urb.c
@@ -429,8 +429,16 @@
case USB_ENDPOINT_XFER_ISOC:
case USB_ENDPOINT_XFER_INT:
/* too small? */
- if (urb->interval <= 0)
- return -EINVAL;
+ switch (dev->speed) {
+ case USB_SPEED_VARIABLE:
+ if (urb->interval < 6)
+ return -EINVAL;
+ break;
+ default:
+ if (urb->interval <= 0)
+ return -EINVAL;
+ break;
+ }
/* too big? */
switch (dev->speed) {
case USB_SPEED_SUPER: /* units are 125us */
@@ -438,6 +446,10 @@
if (urb->interval > (1 << 15))
return -EINVAL;
max = 1 << 15;
+ case USB_SPEED_VARIABLE:
+ if (urb->interval > 16)
+ return -EINVAL;
+ break;
case USB_SPEED_HIGH: /* units are microframes */
/* NOTE usb handles 2^15 */
if (urb->interval > (1024 * 8))
@@ -461,8 +473,10 @@
default:
return -EINVAL;
}
- /* Round down to a power of 2, no more than max */
- urb->interval = min(max, 1 << ilog2(urb->interval));
+ if (dev->speed != USB_SPEED_VARIABLE) {
+ /* Round down to a power of 2, no more than max */
+ urb->interval = min(max, 1 << ilog2(urb->interval));
+ }
}
return usb_hcd_submit_urb(urb, mem_flags);