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    SubjectRe: [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



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