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loop: Remove the unnecessary bdev checks and unused bdev variable 

The lo->lo_device can't be null if the lo->lo_backing_file is set.
So let's remove the unnecessary bdev checks and the entire bdev
variable in __loop_clr_fd() since the lo->lo_backing_file is already
checked before.

Signed-off-by: Xie Yongji <xieyongji@bytedance.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20210922123711.187-4-xieyongji@bytedance.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Xie Yongji 2021-09-22 20:37:10 +08:00 committed by Jens Axboe
parent e515be8f3b
commit 19f553db2a
1 changed files with 3 additions and 6 deletions
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9
drivers/block/loop.c
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@ -1329,7 +1329,6 @@ static int __loop_clr_fd(struct loop_device *lo, bool release)
{
struct file *filp = NULL;
gfp_t gfp = lo->old_gfp_mask;
struct block_device *bdev = lo->lo_device;
int err = 0;
bool partscan = false;
int lo_number;
@ -1397,16 +1396,14 @@ static int __loop_clr_fd(struct loop_device *lo, bool release)
blk_queue_io_min(lo->lo_queue, 512);
invalidate_disk(lo->lo_disk);
loop_sysfs_exit(lo);
if (bdev) {
/* let user-space know about this change */
kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, KOBJ_CHANGE);
}
/* let user-space know about this change */
kobject_uevent(&disk_to_dev(lo->lo_disk)->kobj, KOBJ_CHANGE);
mapping_set_gfp_mask(filp->f_mapping, gfp);
/* This is safe: open() is still holding a reference. */
module_put(THIS_MODULE);
blk_mq_unfreeze_queue(lo->lo_queue);
partscan = lo->lo_flags & LO_FLAGS_PARTSCAN && bdev;
partscan = lo->lo_flags & LO_FLAGS_PARTSCAN;
lo_number = lo->lo_number;
disk_force_media_change(lo->lo_disk, DISK_EVENT_MEDIA_CHANGE);
out_unlock: