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mmc: block: Fix unsupported parallel dispatch of requests

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The mmc block driver does not support parallel dispatch of requests. In
normal circumstances, all requests are anyway funneled through a single
work item, so parallel dispatch never happens. However it can happen if
there is no elevator.

Fix that by detecting if a dispatch is in progress and returning busy
(BLK_STS_RESOURCE) in that case

Fixes: 81196976ed ("mmc: block: Add blk-mq support")
Cc: stable@vger.kernel.org # v4.16+
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Adrian Hunter
2018-08-21 15:05:55 +03:00
committed by Ulf Hansson
parent 17e96d8516
commit 26caddf274
2 changed files with 8 additions and 5 deletions
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drivers/mmc/core/queue.h
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@@ -81,6 +81,7 @@ struct mmc_queue {
unsigned int cqe_busy;
#define MMC_CQE_DCMD_BUSY BIT(0)
#define MMC_CQE_QUEUE_FULL BIT(1)
bool busy;
bool use_cqe;
bool recovery_needed;
bool in_recovery;