This patch tries to release mutex bch_register_lock early, to give chance to stop cache set and bcache device early.
This patch also expends time out of stopping all bcache device from 2 seconds to 10 seconds, because stopping writeback rate update worker may delay for 5 seconds, 2 seconds is not enough. After this patch applied, stopping bcache devices during system reboot or shutdown is very hard to be observed any more. Signed-off-by: Coly Li <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> --- drivers/md/bcache/super.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c index 0363ab534c8e..3f34b96ebbc3 100644 --- a/drivers/md/bcache/super.c +++ b/drivers/md/bcache/super.c @@ -2397,10 +2397,19 @@ static int bcache_reboot(struct notifier_block *n, unsigned long code, void *x) list_for_each_entry_safe(dc, tdc, &uncached_devices, list) bcache_device_stop(&dc->disk); + mutex_unlock(&bch_register_lock); + + /* + * Give an early chance for other kthreads and + * kworkers to stop themselves + */ + schedule(); + /* What's a condition variable? */ while (1) { - long timeout = start + 2 * HZ - jiffies; + long timeout = start + 10 * HZ - jiffies; + mutex_lock(&bch_register_lock); stopped = list_empty(&bch_cache_sets) && list_empty(&uncached_devices); @@ -2412,7 +2421,6 @@ static int bcache_reboot(struct notifier_block *n, unsigned long code, void *x) mutex_unlock(&bch_register_lock); schedule_timeout(timeout); - mutex_lock(&bch_register_lock); } finish_wait(&unregister_wait, &wait); -- 2.16.4
