On Sat, Mar 9, 2013 at 12:50 AM, Alexey Khoroshilov <khoroshi...@ispras.ru> wrote: > As it was described by Oliver Neukum in commit acbe2fe > "USB: Don't use GFP_KERNEL while we cannot reset a storage device": > > Memory allocations with GFP_KERNEL can cause IO to a storage device > which can fail resulting in a need to reset the device. Therefore > GFP_KERNEL cannot be safely used between usb_lock_device() > and usb_unlock_device(). Replace by GFP_NOIO. > > The patch fixes the same issue in usb/core/devio.c. > All the allocations fixed are under usb_lock_device() from usbdev_do_ioctl().
I am wondering why the device lock is needed for usbdev_do_ioctl()? Looks device lock isn't required for USB transfer of kernel driver. Thanks, -- Ming Lei -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
