On Wednesday 10 October 2012 22:07:02 Ming Lei wrote: > On Wed, Oct 10, 2012 at 8:20 PM, Oliver Neukum <oliver@xxxxxxxxxx> wrote: > > For mice with card readers the HID driver can deadlock > > as its post_reset() method allocates memory. GFP_NOIO > > must be used in a block layer error handler, which > > usbhid can be indirectly part of. > > IMO, this kind of "fix" should be discussed further, because in theory > we can't avoid all GFP_KERNEL allocation in both device > reset path and runtime resume path, which may call other > kernel component APIs with GFP_KERNEL allocation. Which components? We generally don't do that. We may have a problem with locks being held though. > So hope to figure out one generic enough solution. This is much harder than it sounds. Regards Oliver -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
