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mmc: block: Simplify cleaning up the queue

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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 <adrian.hunter@intel.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Tested-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Adrian Hunter 2017-11-29 15:40:59 +02:00 committed by Ulf Hansson
parent 4512bd370b
commit 41e3efd07d
2 changed files with 14 additions and 5 deletions
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17
drivers/mmc/core/block.c
View File

@ -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);

2
drivers/mmc/core/queue.c
View File

@ -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;
}