On Wed, May 27, 2020 at 05:49:02PM +0530, Sarthak Garg wrote: > [ Upstream commit 39a22f73744d5baee30b5f134ae2e30b668b66ed ] > > Consider the following stack trace > > -001|raw_spin_lock_irqsave > -002|mmc_blk_cqe_complete_rq > -003|__blk_mq_complete_request(inline) > -003|blk_mq_complete_request(rq) > -004|mmc_cqe_timed_out(inline) > -004|mmc_mq_timed_out > > mmc_mq_timed_out acquires the queue_lock for the first > time. The mmc_blk_cqe_complete_rq function also tries to acquire > the same queue lock resulting in recursive locking where the task > is spinning for the same lock which it has already acquired leading > to watchdog bark. > > Fix this issue with the lock only for the required critical section. > > Cc: <[email protected]> > Fixes: 1e8e55b67030 ("mmc: block: Add CQE support") > Suggested-by: Sahitya Tummala <[email protected]> > Signed-off-by: Sarthak Garg <[email protected]> > Acked-by: Adrian Hunter <[email protected]> > Link: > https://lore.kernel.org/r/[email protected] > Signed-off-by: Ulf Hansson <[email protected]> > ---
Thanks for the backport, now queued up. greg k-h
