From 3461f29b4a995259e23df09fbd212014303d973c Mon Sep 17 00:00:00 2001 From: Jaehoon Chung Date: Wed, 13 Jul 2011 17:02:16 +0900 Subject: [PATCH] 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 Signed-off-by: Kyungmin Park Acked-by: Per Forlin Cc: Signed-off-by: Chris Ball --- drivers/mmc/card/block.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c index b7d22dd8d23c..453695e29e3c 100644 --- a/drivers/mmc/card/block.c +++ b/drivers/mmc/card/block.c @@ -1208,6 +1208,9 @@ 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); -- 2.39.2