[dm-devel] [PATCH V2 2/2] scsi: implement .cleanup_rq callback

[Ming Lei]

On Mon, Jul 22, 2019 at 08:40:23AM -0700, Bart Van Assche wrote:
> On 7/19/19 8:06 PM, Ming Lei wrote:
> > diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
> > index e1da8c70a266..52537c145762 100644
> > --- a/drivers/scsi/scsi_lib.c
> > +++ b/drivers/scsi/scsi_lib.c
> > @@ -154,12 +154,9 @@ scsi_set_blocked(struct scsi_cmnd *cmd, int reason)
> >   static void scsi_mq_requeue_cmd(struct scsi_cmnd *cmd)
> >   {
> > -	if (cmd->request->rq_flags & RQF_DONTPREP) {
> > -		cmd->request->rq_flags &= ~RQF_DONTPREP;
> > -		scsi_mq_uninit_cmd(cmd);
> > -	} else {
> > -		WARN_ON_ONCE(true);
> > -	}
> > +	WARN_ON_ONCE(!(cmd->request->rq_flags & RQF_DONTPREP));
> > +
> > +	scsi_mq_uninit_cmd(cmd);
> >   	blk_mq_requeue_request(cmd->request, true);
> >   }
> 
> The above changes are independent of this patch series. Have you considered
> to move these into a separate patch?

OK.

> 
> > +/*
> > + * Only called when the request isn't completed by SCSI, and not freed by
> > + * SCSI
> > + */
> > +static void scsi_cleanup_rq(struct request *rq)
> > +{
> > +	struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(rq);
> > +
> > +	scsi_mq_uninit_cmd(cmd);
> > +}
> 
> Is the comment above this function correct? The previous patch adds an
> unconditional call to mq_ops->cleanup_rq() in blk_mq_free_request().

You are right, will fix it in V3.

Thanks,
Ming