From: Jan Kara Date: Wed, 7 Aug 2019 09:36:47 +0000 (+0200) Subject: bdev: Fixup error handling in blkdev_get() X-Git-Tag: microblaze-v5.4-rc1~51^2~8 X-Git-Url: http://git.monstr.eu/?a=commitdiff_plain;h=e91455bad5cff40a8c232f2204a5104127e3fec2;p=linux-2.6-microblaze.git bdev: Fixup error handling in blkdev_get() Commit 89e524c04fa9 ("loop: Fix mount(2) failure due to race with LOOP_SET_FD") converted blkdev_get() to use the new helpers for finishing claiming of a block device. However the conversion botched the error handling in blkdev_get() and thus the bdev has been marked as held even in case __blkdev_get() returned error. This led to occasional warnings with block/001 test from blktests like: kernel: WARNING: CPU: 5 PID: 907 at fs/block_dev.c:1899 __blkdev_put+0x396/0x3a0 Correct the error handling. CC: stable@vger.kernel.org Fixes: 89e524c04fa9 ("loop: Fix mount(2) failure due to race with LOOP_SET_FD") Signed-off-by: Jan Kara Signed-off-by: Jens Axboe --- diff --git a/fs/block_dev.c b/fs/block_dev.c index 131e2e0582a6..eb657ab94060 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -1750,7 +1750,10 @@ int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder) /* finish claiming */ mutex_lock(&bdev->bd_mutex); - bd_finish_claiming(bdev, whole, holder); + if (!res) + bd_finish_claiming(bdev, whole, holder); + else + bd_abort_claiming(bdev, whole, holder); /* * Block event polling for write claims if requested. Any * write holder makes the write_holder state stick until