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block: clear GD_NEED_PART_SCAN later in bdev_disk_changed

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[ Upstream commit 5116784039 ]

The GD_NEED_PART_SCAN is set by bdev_check_media_change to initiate
a partition scan while removing a block device. It should be cleared
after blk_drop_paritions because blk_drop_paritions could return
-EBUSY and then the consequence __blkdev_get has no chance to do
delete_partition if GD_NEED_PART_SCAN already cleared.

It causes some problems on some card readers. Ex. Realtek card
reader 0bda:0328 and 0bda:0158. The device node of the partition
will not disappear after the memory card removed. Thus the user
applications can not update the device mapping correctly.

BugLink: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1920874
Signed-off-by: Chris Chiu <chris.chiu@canonical.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20210323085219.24428-1-chris.chiu@canonical.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Chris Chiu 2021-03-23 16:52:19 +08:00 committed by Greg Kroah-Hartman
parent 7c73059bf8
commit 037950869b
1 changed files with 2 additions and 2 deletions
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4
fs/block_dev.c
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@ -1404,13 +1404,13 @@ int bdev_disk_changed(struct block_device *bdev, bool invalidate)
lockdep_assert_held(&bdev->bd_mutex);
clear_bit(GD_NEED_PART_SCAN, &bdev->bd_disk->state);
rescan:
ret = blk_drop_partitions(bdev);
if (ret)
return ret;
clear_bit(GD_NEED_PART_SCAN, &disk->state);
/*
* Historically we only set the capacity to zero for devices that
* support partitions (independ of actually having partitions created).