linux-kernel - Re: [PATCH -next] advansys: remove set but not used variable 'srb_tag' in adv_isr

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Date:   Wed, 17 Oct 2018 06:00:22 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Johannes Thumshirn <jthumshirn@...e.de>
Cc:     YueHaibing <yuehaibing@...wei.com>, hare@...e.com,
        jejb@...ux.vnet.ibm.com, martin.petersen@...cle.com,
        linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: [PATCH -next] advansys: remove set but not used variable
 'srb_tag' in adv_isr_callback

On Wed, Oct 17, 2018 at 02:49:50PM +0200, Johannes Thumshirn wrote:
> On 17/10/18 14:34, YueHaibing wrote:
> > -	srb_tag = le32_to_cpu(scsiqp->srb_tag);
> >  	scp = scsi_host_find_tag(boardp->shost, scsiqp->srb_tag);
> 
> Shouldn't this be:
> 	scp = scsi_host_find_tag(boardp->shost,
> 					le32_to_cpu(scsiqp->srb_tag));

I don't think so.  Look at how scsiqp->srb_tag is set:

 adv_build_req(struct asc_board *boardp, struct scsi_cmnd *scp,
              ADV_SCSI_REQ_Q **adv_scsiqpp)
 {
+       u32 srb_tag = scp->request->tag;
...
+       scsiqp->srb_tag = srb_tag;

If we're not converting it to le32 on the way in, we probably don't want
to convert it back on the way out.

Please don't make me power up my PA-RISC machine with an Advansys card
in it, just to find out ...