On 10/6/19 4:45 AM, Ming Lei wrote: > We will stop hw queue and wait for completion of in-flight requests > when one hctx is becoming dead in the following patch. This way may > cause dead-lock for some stacking blk-mq drivers, such as dm-rq and > loop. > > Add blk-mq flag of BLK_MQ_F_NO_MANAGED_IRQ and mark it for dm-rq and > loop, so we needn't to wait for completion of in-flight requests of > dm-rq & loop, then the potential dead-lock can be avoided. > > Cc: Bart Van Assche <[email protected]> > Cc: Hannes Reinecke <[email protected]> > Cc: Christoph Hellwig <[email protected]> > Cc: Thomas Gleixner <[email protected]> > Cc: Keith Busch <[email protected]> > Signed-off-by: Ming Lei <[email protected]> > --- > block/blk-mq-debugfs.c | 1 + > drivers/block/loop.c | 2 +- > drivers/md/dm-rq.c | 2 +- > include/linux/blk-mq.h | 1 + > 4 files changed, 4 insertions(+), 2 deletions(-) > I would have preferred to queue this patch after the next one; introducing a flag which doesn't do anything is a bit odd to me. But anyway:
Reviewed-by: Hannes Reinecke <[email protected]> Cheers, Hannes -- Dr. Hannes Reinecke Teamlead Storage & Networking [email protected] +49 911 74053 688 SUSE Software Solutions Germany GmbH, Maxfeldstr. 5, 90409 Nürnberg HRB 247165 (AG München), GF: Felix Imendörffer
