On 04/27/2017 07:11 PM, Bart Van Assche wrote: > If blk_get_request() fails check whether the failure is due to > a path being removed. If that is the case fail the path by > triggering a call to fail_path(). This patch avoids that the > following scenario can be encountered while removing paths: > * CPU usage of a kworker thread jumps to 100%. > * Removing the dm device becomes impossible. > > Delay requeueing if blk_get_request() returns -EBUSY or > -EWOULDBLOCK because in these cases immediate requeuing is > inappropriate. > > Signed-off-by: Bart Van Assche <bart.vanassche@xxxxxxxxxxx> > Cc: Hannes Reinecke <hare@xxxxxxxx> > Cc: Christoph Hellwig <hch@xxxxxx> > Cc: <stable@xxxxxxxxxxxxxxx> > --- > drivers/md/dm-mpath.c | 17 ++++++++++++----- > 1 file changed, 12 insertions(+), 5 deletions(-) > Reviewed-by: Hannes Reinecke <hare@xxxxxxxx> Cheers, Hannes -- Dr. Hannes Reinecke Teamlead Storage & Networking hare@xxxxxxx +49 911 74053 688 SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton HRB 21284 (AG Nürnberg)