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mmc: block: fixed NULL pointer dereference 

We already check for ongoing async transfers when handling discard
requests, but not in mmc_blk_issue_flush().  This patch fixes that
omission.

Tested with an SDHCI controller and eMMC4.41.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Per Forlin <per.forlin@linaro.org>
Cc: <stable@kernel.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Jaehoon Chung 2011-07-13 17:02:16 +09:00 committed by Chris Ball
parent 7937e878f9
commit 393f9a08e2
1 changed files with 3 additions and 0 deletions
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3
drivers/mmc/card/block.c
View File

@ -1200,6 +1200,9 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
else
ret = mmc_blk_issue_discard_rq(mq, req);
} else if (req && req->cmd_flags & REQ_FLUSH) {
/* complete ongoing async transfer before issuing flush */
if (card->host->areq)
mmc_blk_issue_rw_rq(mq, NULL);
ret = mmc_blk_issue_flush(mq, req);
} else {
ret = mmc_blk_issue_rw_rq(mq, req);