mmc: block: Simplify cleaning up the queue

ahunter6 · storulf · commit 41e3efd07d5a · 2017-12-11T12:44:31.000+01:00
Use blk_cleanup_queue() to shutdown the queue when the driver is removed,
and instead get an extra reference to the queue to prevent the queue being
freed before the final mmc_blk_put().

Signed-off-by: Adrian Hunter &lt;adrian.hunter@intel.com&gt;
Acked-by: Linus Walleij &lt;linus.walleij@linaro.org&gt;
Signed-off-by: Ulf Hansson &lt;ulf.hansson@linaro.org&gt;
Tested-by: Linus Walleij &lt;linus.walleij@linaro.org&gt;
diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
@@ -189,7 +189,7 @@ static void mmc_blk_put(struct mmc_blk_data *md)
 	md->usage--;
 	if (md->usage == 0) {
 		int devidx = mmc_get_devidx(md->disk);
-		blk_cleanup_queue(md->queue.queue);
+		blk_put_queue(md->queue.queue);
 		ida_simple_remove(&mmc_blk_ida, devidx);
 		put_disk(md->disk);
 		kfree(md);
@@ -2156,6 +2156,17 @@ static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
 
 	md->queue.blkdata = md;
 
+	/*
+	 * Keep an extra reference to the queue so that we can shutdown the
+	 * queue (i.e. call blk_cleanup_queue()) while there are still
+	 * references to the 'md'. The corresponding blk_put_queue() is in
+	 * mmc_blk_put().
+	 */
+	if (!blk_get_queue(md->queue.queue)) {
+		mmc_cleanup_queue(&md->queue);
+		goto err_putdisk;
+	}
+
 	md->disk->major	= MMC_BLOCK_MAJOR;
 	md->disk->first_minor = devidx * perdev_minors;
 	md->disk->fops = &mmc_bdops;
@@ -2471,10 +2482,6 @@ static void mmc_blk_remove_req(struct mmc_blk_data *md)
 		 * from being accepted.
 		 */
 		card = md->queue.card;
-		spin_lock_irq(md->queue.queue->queue_lock);
-		queue_flag_set(QUEUE_FLAG_BYPASS, md->queue.queue);
-		spin_unlock_irq(md->queue.queue->queue_lock);
-		blk_set_queue_dying(md->queue.queue);
 		mmc_cleanup_queue(&md->queue);
 		if (md->disk->flags & GENHD_FL_UP) {
 			device_remove_file(disk_to_dev(md->disk), &md->force_ro);
diff --git a/drivers/mmc/core/queue.c b/drivers/mmc/core/queue.c
@@ -268,6 +268,8 @@ void mmc_cleanup_queue(struct mmc_queue *mq)
 	blk_start_queue(q);
 	spin_unlock_irqrestore(q->queue_lock, flags);
 
+	blk_cleanup_queue(q);
+
 	mq->card = NULL;
 }
 

Original file line number	Diff line number	Diff line change
`@@ -268,6 +268,8 @@ void mmc_cleanup_queue(struct mmc_queue *mq)`
`268`	`268`	`blk_start_queue(q);`
`269`	`269`	`spin_unlock_irqrestore(q->queue_lock, flags);`
`270`	`270`
	`271`	`+ blk_cleanup_queue(q);`
	`272`	`+`
`271`	`273`	`mq->card = NULL;`
`272`	`274`	`}`
`273`	`275`