linux-kernel - [PATCH 4.10 103/111] mmc: block: Fix is_waiting_last

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Date:   Tue, 28 Mar 2017 14:31:29 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: [PATCH 4.10 103/111] mmc: block: Fix is_waiting_last_req set incorrectly

4.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Adrian Hunter <adrian.hunter@...el.com>

commit 2602b740e45cc64feb55d5a9ee8db744ab3becbb upstream.

Commit 15520111500c ("mmc: core: Further fix thread wake-up") allowed a
queue to release the host with is_waiting_last_req set to true. A queue
waiting to claim the host will not reset it, which can result in the
queue getting stuck in a loop.

Fixes: 15520111500c ("mmc: core: Further fix thread wake-up")
Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/mmc/core/block.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -1791,6 +1791,7 @@ int mmc_blk_issue_rq(struct mmc_queue *m
 		ret = mmc_blk_issue_flush(mq, req);
 	} else {
 		ret = mmc_blk_issue_rw_rq(mq, req);
+		card->host->context_info.is_waiting_last_req = false;
 	}
 
 out: