RE: [PATCH 0/2] Fix UFS task management command timeout

[Avri Altman]

> 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.
Is this the same issue that was addressed here - https://www.spinics.net/lists/linux-scsi/msg164520.html ?

Thanks,
Avri

> 
> 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