On Wed, Mar 20, 2019 at 04:52:40PM +0800, zhengbin (A) wrote: > Thanks for your quick reply, I will study BLK_STS_DEV_RESOURCE in detail > > > BLK_STS_DEV_RESOURCE means that the driver will rerun hw queue, so > > maybe you need to investigate why it is returned from scsi driver first. > because we set the device state to blocked, > scsi_queue_rq-->prep_to_mq(return BLK_STS_RESOURCE) > -->out_put_budget transfer BLK_STS_RESOURCE to BLK_STS_DEV_RESOURCE > In this situtation, the request does not send to the driver. Then the queue will be run when the scsi_device becomes un-blocked, see scsi_internal_device_unblock_nowait(). Thanks, Ming
