bcache: acquire bch_register_lock later in cached_dev_detach_finish()

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Now there is variable bcache_is_reboot to prevent device register or
unregister during reboot, it is unncessary to still hold mutex lock
bch_register_lock before stopping writeback_rate_update kworker and
writeback kthread. And if the stopping kworker or kthread holding
bch_register_lock inside their routine (we used to have such problem
in writeback thread, thanks to Junhui Wang fixed it), it is very easy
to introduce deadlock during reboot/shutdown procedure.

Therefore in this patch, the location to acquire bch_register_lock is
moved to the location before calling calc_cached_dev_sectors(). Which
is later then original location in cached_dev_detach_finish().

Signed-off-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Coly Li 2019-06-28 19:59:47 +08:00 • committed by Jens Axboe

parent a59ff6ccc2

commit 97ba3b816e

1 changed files with 2 additions and 1 deletions

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drivers/md/bcache/super.c

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