diff options
| author |   Christoph Hellwig <hch@lst.de> | 2022-02-15 10:45:13 +0100 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2022-02-16 19:44:24 -0700 |
| commit | 185ed423d1898ead071c18f6161959cd3cab2dde (patch) | |
| tree | f4317fc2c5a03a9e4640ffd3e177e8d4727e8b8a | |
| parent | memstick/mspro_block: fix handling of read-only devices (diff) | |
| download | linux-dev-185ed423d1898ead071c18f6161959cd3cab2dde.tar.xz linux-dev-185ed423d1898ead071c18f6161959cd3cab2dde.zip | |
memstick/mspro_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/20220215094514.3828912-5-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | drivers/memstick/core/mspro_block.c | 49 |
1 files changed, 7 insertions, 42 deletions
diff --git a/drivers/memstick/core/mspro_block.c b/drivers/memstick/core/mspro_block.c index 7ea312f0840e..725ba74ded30 100644 --- a/drivers/memstick/core/mspro_block.c +++ b/drivers/memstick/core/mspro_block.c @@ -133,7 +133,6 @@ struct mspro_devinfo { struct mspro_block_data { struct memstick_dev *card; - unsigned int usage_count; unsigned int caps; struct gendisk *disk; struct request_queue *queue; @@ -178,48 +177,16 @@ static int mspro_block_complete_req(struct memstick_dev *card, int error); /*** Block device ***/ -static int mspro_block_bd_open(struct block_device *bdev, fmode_t mode) -{ - struct gendisk *disk = bdev->bd_disk; - struct mspro_block_data *msb = disk->private_data; - int rc = -ENXIO; - - mutex_lock(&mspro_block_disk_lock); - - if (msb && msb->card) - msb->usage_count++; - - mutex_unlock(&mspro_block_disk_lock); - - return rc; -} - - -static void mspro_block_disk_release(struct gendisk *disk) +static void mspro_block_bd_free_disk(struct gendisk *disk) { struct mspro_block_data *msb = disk->private_data; int disk_id = MINOR(disk_devt(disk)) >> MSPRO_BLOCK_PART_SHIFT; mutex_lock(&mspro_block_disk_lock); - - if (msb) { - if (msb->usage_count) - msb->usage_count--; - - if (!msb->usage_count) { - kfree(msb); - disk->private_data = NULL; - idr_remove(&mspro_block_disk_idr, disk_id); - put_disk(disk); - } - } - + idr_remove(&mspro_block_disk_idr, disk_id); mutex_unlock(&mspro_block_disk_lock); -} -static void mspro_block_bd_release(struct gendisk *disk, fmode_t mode) -{ - mspro_block_disk_release(disk); + kfree(msb); } static int mspro_block_bd_getgeo(struct block_device *bdev, @@ -235,10 +202,9 @@ static int mspro_block_bd_getgeo(struct block_device *bdev, } static const struct block_device_operations ms_block_bdops = { - .open = mspro_block_bd_open, - .release = mspro_block_bd_release, - .getgeo = mspro_block_bd_getgeo, - .owner = THIS_MODULE + .owner = THIS_MODULE, + .getgeo = mspro_block_bd_getgeo, + .free_disk = mspro_block_bd_free_disk, }; /*** Information ***/ @@ -1221,7 +1187,6 @@ static int mspro_block_init_disk(struct memstick_dev *card) msb->disk->first_minor = disk_id << MSPRO_BLOCK_PART_SHIFT; msb->disk->minors = 1 << MSPRO_BLOCK_PART_SHIFT; msb->disk->fops = &ms_block_bdops; - msb->usage_count = 1; msb->disk->private_data = msb; sprintf(msb->disk->disk_name, "mspblk%d", disk_id); @@ -1339,7 +1304,7 @@ static void mspro_block_remove(struct memstick_dev *card) mspro_block_data_clear(msb); mutex_unlock(&mspro_block_disk_lock); - mspro_block_disk_release(msb->disk); + put_disk(msb->disk); memstick_set_drvdata(card, NULL); } |