On UTP_TASK_REQ_COMPL interrupt, ufshcd_tmc_handler() iterates through busy requests in tags->rqs and complete request if corresponding doorbell flag is reset. However, ufshcd_issue_tm_cmd() allocates requests from tags->static_rqs and trigger doorbell directly without dispatching request through block layer, thus requests can never be found in tags->rqs and completed properly. Any TM command issued by ufshcd_issue_tm_cmd() inevitably timeout and further leads to recovery flow failure when LU Reset or Abort Task is issued. In this patch, blk_mq_tagset_busy_iter() call in ufshcd_tmc_handler() is replaced with new interface, blk_mq_drv_tagset_busy_iter(), to allow completion of request allocted by driver. The new interface is introduced for driver to iterate through requests in static_rqs. Po-Wen Kao (2): blk-mq: new busy request iterator for driver scsi: ufs: fix TM request timeout block/blk-mq-tag.c | 36 ++++++++++++++++++++++++++++++------ drivers/scsi/ufs/ufshcd.c | 2 +- include/linux/blk-mq.h | 4 ++++ 3 files changed, 35 insertions(+), 7 deletions(-) -- 2.18.0
