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bcache: stop writeback kthread and kworker when bch_cached_dev_run() failed 

In bch_cached_dev_attach() after bch_cached_dev_writeback_start()
called, the wrireback kthread and writeback rate update kworker of the
cached device are created, if the following bch_cached_dev_run()
failed, bch_cached_dev_attach() will return with -ENOMEM without
stopping the writeback related kthread and kworker.

This patch stops writeback kthread and writeback rate update kworker
before returning -ENOMEM if bch_cached_dev_run() returns error.

Signed-off-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Coly Li 2019-06-28 19:59:45 +08:00 committed by Jens Axboe
parent f54d801dda
commit 5c2a634cbf
1 changed files with 8 additions and 0 deletions
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8
drivers/md/bcache/super.c
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@ -1189,6 +1189,14 @@ int bch_cached_dev_attach(struct cached_dev *dc, struct cache_set *c,
ret = bch_cached_dev_run(dc);
if (ret && (ret != -EBUSY)) {
up_write(&dc->writeback_lock);
/*
* bch_register_lock is held, bcache_device_stop() is not
* able to be directly called. The kthread and kworker
* created previously in bch_cached_dev_writeback_start()
* have to be stopped manually here.
*/
kthread_stop(dc->writeback_thread);
cancel_writeback_rate_update_dwork(dc);
pr_err("Couldn't run cached device %s",
dc->backing_dev_name);
return ret;