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authorChristoph Hellwig <hch@lst.de>2022-02-15 10:45:11 +0100
committerJens Axboe <axboe@kernel.dk>2022-02-16 19:44:24 -0700
commite2efa0796607efe60c708271be483c3a2b0128de (patch)
tree62789bdb79fc0f7d907414704e78d01fb35d82eb
parent76792055c4c8b2472ca1ae48e0ddaf8497529f08 (diff)
memstick/ms_block: simplify refcounting
Implement the ->free_disk method to free the msb_data structure only once the last gendisk reference goes away instead of keeping a local refcount. Signed-off-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20220215094514.3828912-3-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
-rw-r--r--drivers/memstick/core/ms_block.c64
-rw-r--r--drivers/memstick/core/ms_block.h1
2 files changed, 15 insertions, 50 deletions
diff --git a/drivers/memstick/core/ms_block.c b/drivers/memstick/core/ms_block.c
index 0cda6c6baefc..3993bdd4b519 100644
--- a/drivers/memstick/core/ms_block.c
+++ b/drivers/memstick/core/ms_block.c
@@ -1943,22 +1943,6 @@ static void msb_io_work(struct work_struct *work)
static DEFINE_IDR(msb_disk_idr); /*set of used disk numbers */
static DEFINE_MUTEX(msb_disk_lock); /* protects against races in open/release */
-static int msb_bd_open(struct block_device *bdev, fmode_t mode)
-{
- struct gendisk *disk = bdev->bd_disk;
- struct msb_data *msb = disk->private_data;
-
- dbg_verbose("block device open");
-
- mutex_lock(&msb_disk_lock);
-
- if (msb && msb->card)
- msb->usage_count++;
-
- mutex_unlock(&msb_disk_lock);
- return 0;
-}
-
static void msb_data_clear(struct msb_data *msb)
{
kfree(msb->boot_page);
@@ -1968,33 +1952,6 @@ static void msb_data_clear(struct msb_data *msb)
msb->card = NULL;
}
-static int msb_disk_release(struct gendisk *disk)
-{
- struct msb_data *msb = disk->private_data;
-
- dbg_verbose("block device release");
- mutex_lock(&msb_disk_lock);
-
- if (msb) {
- if (msb->usage_count)
- msb->usage_count--;
-
- if (!msb->usage_count) {
- disk->private_data = NULL;
- idr_remove(&msb_disk_idr, msb->disk_id);
- put_disk(disk);
- kfree(msb);
- }
- }
- mutex_unlock(&msb_disk_lock);
- return 0;
-}
-
-static void msb_bd_release(struct gendisk *disk, fmode_t mode)
-{
- msb_disk_release(disk);
-}
-
static int msb_bd_getgeo(struct block_device *bdev,
struct hd_geometry *geo)
{
@@ -2003,6 +1960,17 @@ static int msb_bd_getgeo(struct block_device *bdev,
return 0;
}
+static void msb_bd_free_disk(struct gendisk *disk)
+{
+ struct msb_data *msb = disk->private_data;
+
+ mutex_lock(&msb_disk_lock);
+ idr_remove(&msb_disk_idr, msb->disk_id);
+ mutex_unlock(&msb_disk_lock);
+
+ kfree(msb);
+}
+
static blk_status_t msb_queue_rq(struct blk_mq_hw_ctx *hctx,
const struct blk_mq_queue_data *bd)
{
@@ -2096,10 +2064,9 @@ static void msb_start(struct memstick_dev *card)
}
static const struct block_device_operations msb_bdops = {
- .open = msb_bd_open,
- .release = msb_bd_release,
- .getgeo = msb_bd_getgeo,
- .owner = THIS_MODULE
+ .owner = THIS_MODULE,
+ .getgeo = msb_bd_getgeo,
+ .free_disk = msb_bd_free_disk,
};
static const struct blk_mq_ops msb_mq_ops = {
@@ -2147,7 +2114,6 @@ static int msb_init_disk(struct memstick_dev *card)
set_capacity(msb->disk, capacity);
dbg("Set total disk size to %lu sectors", capacity);
- msb->usage_count = 1;
msb->io_queue = alloc_ordered_workqueue("ms_block", WQ_MEM_RECLAIM);
INIT_WORK(&msb->io_work, msb_io_work);
sg_init_table(msb->prealloc_sg, MS_BLOCK_MAX_SEGS+1);
@@ -2229,7 +2195,7 @@ static void msb_remove(struct memstick_dev *card)
msb_data_clear(msb);
mutex_unlock(&msb_disk_lock);
- msb_disk_release(msb->disk);
+ put_disk(msb->disk);
memstick_set_drvdata(card, NULL);
}
diff --git a/drivers/memstick/core/ms_block.h b/drivers/memstick/core/ms_block.h
index 122e1a8a8bd5..7058f9aefeb9 100644
--- a/drivers/memstick/core/ms_block.h
+++ b/drivers/memstick/core/ms_block.h
@@ -143,7 +143,6 @@ struct ms_boot_page {
} __packed;
struct msb_data {
- unsigned int usage_count;
struct memstick_dev *card;
struct gendisk *disk;
struct request_queue *queue;