On Wednesday 10 October 2012 22:07:02 Ming Lei wrote:
> On Wed, Oct 10, 2012 at 8:20 PM, Oliver Neukum <[email protected]> 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 [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
