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: stable@vger.kernel.org Fixes: 1e8e55b67030 ("mmc: block: Add CQE support") Suggested-by: Sahitya Tummala stummala@codeaurora.org Signed-off-by: Sarthak Garg sartgarg@codeaurora.org Acked-by: Adrian Hunter adrian.hunter@intel.com Link: https://lore.kernel.org/r/1588868135-31783-1-git-send-email-vbadigan@codeaur... Signed-off-by: Ulf Hansson ulf.hansson@linaro.org
Thanks for the backport, now queued up.
greg k-h