This is a note to let you know that I've just added the patch titled
block: clear GD_NEED_PART_SCAN later in bdev_disk_changed
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
block-clear-gd_need_part_scan-later-in-bdev_disk_cha.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 77008337f705ec8d1102305192b7b18ecf0b360f
Author: Chris Chiu <chris.chiu@xxxxxxxxxxxxx>
Date: Tue Mar 23 16:52:19 2021 +0800
block: clear GD_NEED_PART_SCAN later in bdev_disk_changed
[ Upstream commit 5116784039f0421e9a619023cfba3e302c3d9adc ]
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@xxxxxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Link: https://lore.kernel.org/r/20210323085219.24428-1-chris.chiu@xxxxxxxxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/block_dev.c b/fs/block_dev.c
index fe201b757baa..6516051807b8 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -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).
