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bdi: add a ->dev_name field to struct backing_dev_info

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[ Upstream commit 6bd87eec23 ]

Cache a copy of the name for the life time of the backing_dev_info
structure so that we can reference it even after unregistering.

Fixes: 68f23b8906 ("memcg: fix a crash in wb_workfn when a device disappears")
Reported-by: Yufen Yu <yuyufen@huawei.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Christoph Hellwig
2020-05-04 14:47:56 +02:00
committed by Greg Kroah-Hartman
parent 25390a3198
commit 03447528a3
2 changed files with 4 additions and 2 deletions
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include/linux/backing-dev-defs.h
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@@ -220,6 +220,7 @@ struct backing_dev_info {
wait_queue_head_t wb_waitq;
struct device *dev;
char dev_name[64];
struct device *owner;
struct timer_list laptop_mode_wb_timer;