On Wed, Aug 02, 2006 at 11:00:58PM -0700, Pete Zaitcev wrote:
> Replace the semaphore exclusive_access with an open-coded lock for
> the special use. The lock can be taken for: read, write, and both.
> This way, two bulk URBs can be submitted simultaneously with ioctl
> USBDEVFS_BULK: one read and one write. Such access was possible
> before 2.4.28.
>
> Signed-off-By: Pete Zaitcev <[email protected]>
>
> ---
>
> The semaphore was introduced in 2.4.28 for the purpose of exclusion
> between access from device.c (cat /proc/bus/usb/devices), devio.c
> through libusb, and in-kernel driver. Currently, only usb-storage
> observes the locking protocol. The most popular device which locks
> in case of simultaneous access is TEAC CD-210PU.
Perfect. Patch queued, thanks Pete.
Willy
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
