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linux/drivers/mmc
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Ulf Hansson 3a574919f0 mmc: core: Avoid hanging to claim host for mmc via some nested calls 
As the block layer, since the conversion to blkmq, claims the host using a
context, a following nested call to mmc_claim_host(), which isn't using a
context, may hang.

Calling mmc_interrupt_hpi() and mmc_read_bkops_status() via the mmc block
layer, may suffer from this problem, as these functions are calling
mmc_claim|release_host().

Let's fix the problem by removing the calls to mmc_claim|release_host()
from the above mentioned functions and instead make the callers responsible
of claiming/releasing the host. As a matter of fact, the existing callers
already deals with it.

Fixes: 81196976ed ("mmc: block: Add blk-mq support")
Reported-by: Dmitry Osipenko <digetx@gmail.com>
Suggested-by: Adrian Hunter <adrian.hunter@intel.com>
Tested-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com>
History 2018-02-27 15:12:37 +01:00
..
core mmc: core: Avoid hanging to claim host for mmc via some nested calls 2018-02-27 15:12:37 +01:00
host mmc: dw_mmc: Avoid accessing registers in runtime suspended state 2018-02-27 15:12:36 +01:00
Kconfig mmc: core: Remove option not to use blk-mq 2017-12-11 12:55:02 +01:00
Makefile mmc: Kconfig: downgrade CONFIG_MMC_DEBUG for host drivers only 2017-08-30 14:01:34 +02:00