Hi.
I send to mailing for [RFC] Kernel NULL pointer dereference.
This patch is fixed it.
In similar case, when discard request, check condition and
performed mmc_blk_issue_rw_rq(mq, NULL) for ongoing async transfer.
But When flush request, entered the mmc_blk_issue_flush() then return.
(then didn't complete ongoing aync transfer).
I think that need to complete for ongoing aync transfer before flush request.
I tested with this patch, it's working fine.
(SDHCI controller, eMMC4.41)
Signed-off-by: Jaehoon Chung <jh80.chung@xxxxxxxxxxx>
Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
---
drivers/mmc/card/block.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index 38d0149..1ff5486 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -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);
--
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