linux-kernel - Re: [PATCH] block: clear GD_NEED_PART_SCAN later in bdev_disk

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Message-ID: <0ec65a30-741d-9f22-e90b-1f72f68b4346@kernel.dk>
Date:   Tue, 23 Mar 2021 09:58:54 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     chris.chiu@...onical.com, viro@...iv.linux.org.uk, hch@....de
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] block: clear GD_NEED_PART_SCAN later in bdev_disk_changed

On 3/23/21 2:52 AM, chris.chiu@...onical.com wrote:
> From: Chris Chiu <chris.chiu@...onical.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.

Applied, thanks.

-- 
Jens Axboe