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authorDing Wang <justin.wang@spreadtrum.com>2015-05-18 20:14:15 +0800
committerUlf Hansson <ulf.hansson@linaro.org>2015-06-16 08:58:36 +0200
commit29535f7b797df35cc9b6b3bca635591cdd3dd2a8 (patch)
treec09f2eef4aa08d88634eeb0863aa993bc8518273
parent62a7f368ffbc13d9aedfdd7aeae711b177db69ac (diff)
downloadlinux-29535f7b797df35cc9b6b3bca635591cdd3dd2a8.tar.bz2
mmc: card: Fixup request missing in mmc_blk_issue_rw_rq
The current handler of MMC_BLK_CMD_ERR in mmc_blk_issue_rw_rq function may cause new coming request permanent missing when the ongoing request (previoulsy started) complete end. The problem scenario is as follows: (1) Request A is ongoing; (2) Request B arrived, and finally mmc_blk_issue_rw_rq() is called; (3) Request A encounters the MMC_BLK_CMD_ERR error; (4) In the error handling of MMC_BLK_CMD_ERR, suppose mmc_blk_cmd_err() end request A completed and return zero. Continue the error handling, suppose mmc_blk_reset() reset device success; (5) Continue the execution, while loop completed because variable ret is zero now; (6) Finally, mmc_blk_issue_rw_rq() return without processing request B. The process related to the missing request may wait that IO request complete forever, possibly crashing the application or hanging the system. Fix this issue by starting new request when reset success. Signed-off-by: Ding Wang <justin.wang@spreadtrum.com> Fixes: 67716327eec7 ("mmc: block: add eMMC hardware reset support") Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
-rw-r--r--drivers/mmc/card/block.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index fc0317124276..c9c3d20b784b 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -1920,9 +1920,11 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
break;
case MMC_BLK_CMD_ERR:
ret = mmc_blk_cmd_err(md, card, brq, req, ret);
- if (!mmc_blk_reset(md, card->host, type))
- break;
- goto cmd_abort;
+ if (mmc_blk_reset(md, card->host, type))
+ goto cmd_abort;
+ if (!ret)
+ goto start_new_req;
+ break;
case MMC_BLK_RETRY:
retune_retry_done = brq->retune_retry_done;
if (retry++ < 5)