diff options
| author | David Vrabel <david.vrabel@csr.com> | 2009-08-18 16:11:24 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-12-11 11:55:14 -0800 |
| commit | 8e08b9766b50826e12139a821b6b3bdfcadcceda (patch) | |
| tree | 0430b4ea03a4e92b6e1d503c763a2a38359a4873 /drivers/usb/core/urb.c | |
| parent | 294a39e7829dfd663e6c5c94cede0c6a0c13e37f (diff) | |
| download | linux-8e08b9766b50826e12139a821b6b3bdfcadcceda.tar.bz2 | |
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>
Diffstat (limited to 'drivers/usb/core/urb.c')
| -rw-r--r-- | drivers/usb/core/urb.c | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/drivers/usb/core/urb.c b/drivers/usb/core/urb.c index 0885d4abdc62..e7cae1334693 100644 --- a/drivers/usb/core/urb.c +++ b/drivers/usb/core/urb.c @@ -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? */ - 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 @@ 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)) @@ -461,8 +473,10 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags) 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); |