Commit 8e08b976 authored by David Vrabel's avatar David Vrabel Committed by Greg Kroah-Hartman

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: default avatarDavid Vrabel <david.vrabel@csr.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 294a39e7
......@@ -429,8 +429,16 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags)
case USB_ENDPOINT_XFER_ISOC:
case USB_ENDPOINT_XFER_INT:
/* too small? */
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 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags)
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))
......@@ -461,9 +473,11 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags)
default:
return -EINVAL;
}
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);
}
......
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