Feature #3220
Updated by Alexey Khoroshilov about 11 years ago
*Not disabling IO during memory allocation while holding a USB device lock* *SUMMARY* You should use `GFP_NOIO` instead of `GFP_KERNEL` for memory allocations between `usb_lock_device()` and `usb_unlock_device()` invocations. *DESCRIPTION* Memory allocations with `GFP_KERNEL` flag can cause input/output operations to a storage device. These operations can fail thus requiring to reset the device. Therefore `GFP_KERNEL` cannot be safely used between `usb_lock_device()` and `usb_unlock_device()` incovations. It should be replaced by `GFP_NOIO`. *LINKS* [Sample bugfix](http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=acbe2febe71abb2360b008e9ab3ee5c44169f78c) bugfix](http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.32.y.git;a=commitdiff;h=186c74d336e2c1377df9e5dc88f7966b2dd6acf7) *EXAMPLE* The following drivers contain this error (in version 2.6.32): * `drivers/usb/core/devices.c` * `drivers/usb/core/message.c`