diff options
| author | Avri Altman <avri.altman@wdc.com> | 2021-04-25 09:02:06 +0300 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2021-04-26 12:37:23 +0300 |
| commit | 97fce126e279690105ee15be652b465fd96f9997 (patch) | |
| tree | 2dd3ab5aa9deb206c7a5fbaec6e95414b01c7285 /drivers/mmc/core/block.c | |
| parent | 2f156712be4ab4c2707e096d619dc8bfbd01d388 (diff) | |
| download | linux-97fce126e279690105ee15be652b465fd96f9997.tar.xz | |
mmc: block: Issue a cache flush only when it's enabled
In command queueing mode, the cache isn't flushed via the mmc_flush_cache()
function, but instead by issuing a CMDQ_TASK_MGMT (CMD48) with a
FLUSH_CACHE opcode. In this path, we need to check if cache has been
enabled, before deciding to flush the cache, along the lines of what's
being done in mmc_flush_cache().
To fix this problem, let's add a new bus ops callback ->cache_enabled() and
implement it for the mmc bus type. In this way, the mmc block device driver
can call it to know whether cache flushing should be done.
Fixes: 1e8e55b67030 (mmc: block: Add CQE support)
Cc: stable@vger.kernel.org
Reported-by: Brendan Peter <bpeter@lytx.com>
Signed-off-by: Avri Altman <avri.altman@wdc.com>
Tested-by: Brendan Peter <bpeter@lytx.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/20210425060207.2591-2-avri.altman@wdc.com
Link: https://lore.kernel.org/r/20210425060207.2591-3-avri.altman@wdc.com
[Ulf: Squashed the two patches and made some minor updates]
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc/core/block.c')
| -rw-r--r-- | drivers/mmc/core/block.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c index 6cd5d03bcc64..689eb9afeeed 100644 --- a/drivers/mmc/core/block.c +++ b/drivers/mmc/core/block.c @@ -2237,6 +2237,10 @@ enum mmc_issued mmc_blk_mq_issue_rq(struct mmc_queue *mq, struct request *req) case MMC_ISSUE_ASYNC: switch (req_op(req)) { case REQ_OP_FLUSH: + if (!mmc_cache_enabled(host)) { + blk_mq_end_request(req, BLK_STS_OK); + return MMC_REQ_FINISHED; + } ret = mmc_blk_cqe_issue_flush(mq, req); break; case REQ_OP_READ: |