Messages in this thread | | | Date | Thu, 19 Nov 2015 10:10:19 +0100 (CET) | From | Jiri Kosina <> | Subject | Re: [PATCH] hid: usbhid: hid-core: fix recursive deadlock |
| |
On Thu, 19 Nov 2015, Ioan-Adrian Ratiu wrote:
> First part of lockdep report: > http://imgur.com/clLsCWe > > Second part: > http://imgur.com/Wa2PzRl > > Here are some printk's of mine while reproducing + debugging the issue: > http://imgur.com/SETOHT7
So the real problem is that Intuos driver is calling hid_hw_request() (which tries to grab the lock in usbhid_submit_report()) while handling the CTRL IRQ (lock gets acquired there).
So the proper way to fix seems to be delaying the scheduling of the proximity read event in wacom_intuos_inout() to workqueue.
> I'll continue to research this more in depth, but progress is slow > because I don't have much time, I'm doing this in my spare time because > it's my girlfriend's tablet.
Oh, now I understand the level of severity of this bug! :-)
Thanks,
-- Jiri Kosina SUSE Labs
| |