From: chris.chiu@canonical.com
To: viro@zeniv.linux.org.uk, hch@lst.de, axboe@kernel.dk
Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
Chris Chiu <chris.chiu@canonical.com>
Subject: [PATCH] block: clear GD_NEED_PART_SCAN later in bdev_disk_changed
Date: Tue, 23 Mar 2021 16:52:19 +0800 [thread overview]
Message-ID: <20210323085219.24428-1-chris.chiu@canonical.com> (raw)
From: Chris Chiu <chris.chiu@canonical.com>
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>
---
fs/block_dev.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 92ed7d5df677..28d583fcdc2c 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1240,13 +1240,13 @@ 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).
--
2.20.1
next reply other threads:[~2021-03-23 8:53 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-23 8:52 chris.chiu [this message]
2021-03-23 15:51 ` [PATCH] block: clear GD_NEED_PART_SCAN later in bdev_disk_changed Christoph Hellwig
2021-03-23 15:58 ` Jens Axboe
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