[patch 21/42] mmc_block: fix queue cleanup

[patch 21/42] mmc_block: fix queue cleanup

[akpm]

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

The main bug was that 'blk_cleanup_queue()' was called while the block
device could still be in use, for example, because the card was removed
while files were still open.

In addition, to be sure that 'mmc_request()' will get called for all new
requests (so it can error them out), the queue is emptied during cleanup. 
This is done after the worker thread is stopped to avoid racing with it.

Finally, it is not a device error for this to be happening, so quiet the
(sometimes very many) error messages.

Signed-off-by: Adrian Hunter <adrian.hunter@nokia.com>
Cc: <linux-mmc@vger.kernel.org>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/mmc/card/block.c |    2 ++
 drivers/mmc/card/queue.c |   18 +++++++++---------
 2 files changed, 11 insertions(+), 9 deletions(-)

diff -puN drivers/mmc/card/block.c~mmc_block-fix-queue-cleanup drivers/mmc/card/block.c
--- a/drivers/mmc/card/block.c~mmc_block-fix-queue-cleanup
+++ a/drivers/mmc/card/block.c
@@ -91,6 +91,8 @@ static void mmc_blk_put(struct mmc_blk_d
 		if (!devmaj)
 			devidx = md->disk->first_minor >> MMC_SHIFT;
 
+		blk_cleanup_queue(md->queue.queue);
+
 		__clear_bit(devidx, dev_use);
 
 		put_disk(md->disk);
diff -puN drivers/mmc/card/queue.c~mmc_block-fix-queue-cleanup drivers/mmc/card/queue.c
--- a/drivers/mmc/card/queue.c~mmc_block-fix-queue-cleanup
+++ a/drivers/mmc/card/queue.c
@@ -90,9 +90,10 @@ static void mmc_request(struct request_q
 	struct request *req;
 
 	if (!mq) {
-		printk(KERN_ERR "MMC: killing requests for dead queue\n");
-		while ((req = blk_fetch_request(q)) != NULL)
+		while ((req = blk_fetch_request(q)) != NULL) {
+			req->cmd_flags |= REQ_QUIET;
 			__blk_end_request_all(req, -EIO);
+		}
 		return;
 	}
 
@@ -223,17 +224,18 @@ void mmc_cleanup_queue(struct mmc_queue 
 	struct request_queue *q = mq->queue;
 	unsigned long flags;
 
-	/* Mark that we should start throwing out stragglers */
-	spin_lock_irqsave(q->queue_lock, flags);
-	q->queuedata = NULL;
-	spin_unlock_irqrestore(q->queue_lock, flags);
-
 	/* Make sure the queue isn't suspended, as that will deadlock */
 	mmc_queue_resume(mq);
 
 	/* Then terminate our worker thread */
 	kthread_stop(mq->thread);
 
+	/* Empty the queue */
+	spin_lock_irqsave(q->queue_lock, flags);
+	q->queuedata = NULL;
+	blk_start_queue(q);
+	spin_unlock_irqrestore(q->queue_lock, flags);
+
  	if (mq->bounce_sg)
  		kfree(mq->bounce_sg);
  	mq->bounce_sg = NULL;
@@ -245,8 +247,6 @@ void mmc_cleanup_queue(struct mmc_queue 
 		kfree(mq->bounce_buf);
 	mq->bounce_buf = NULL;
 
-	blk_cleanup_queue(mq->queue);
-
 	mq->card = NULL;
 }
 EXPORT_SYMBOL(mmc_cleanup_queue);
_