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authorAdrian Hunter <adrian.hunter@nokia.com>2010-01-08 14:43:00 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2010-01-11 09:34:06 -0800
commit5fa83ce284a4b7cd9dcfadd01500b0ed4ab9b740 (patch)
tree853c2e06c085fba633bcfef2c624a068adf2bbf5 /drivers/mmc/card
parent0a74ff29b8dd8b748f8856352f9a9b5c6cc362cc (diff)
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mmc_block: fix queue cleanup
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> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/mmc/card')
-rw-r--r--drivers/mmc/card/block.c2
-rw-r--r--drivers/mmc/card/queue.c18
2 files changed, 11 insertions, 9 deletions
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index ee87911..1f552c6 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -91,6 +91,8 @@ static void mmc_blk_put(struct mmc_blk_data *md)
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 --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
index 49e5823..c5a7a85 100644
--- a/drivers/mmc/card/queue.c
+++ b/drivers/mmc/card/queue.c
@@ -90,9 +90,10 @@ static void mmc_request(struct request_queue *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 *mq)
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 *mq)
kfree(mq->bounce_buf);
mq->bounce_buf = NULL;
- blk_cleanup_queue(mq->queue);
-
mq->card = NULL;
}
EXPORT_SYMBOL(mmc_cleanup_queue);