linux-kernel - Re: [PATCH scsi] Short the path length of scsi_cmd_to

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Date:	Thu, 27 Sep 2012 13:43:18 -0400
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	Li Zhong <zhong@...ux.vnet.ibm.com>
Cc:	James Bottomley <James.Bottomley@...senpartnership.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	LKML <linux-kernel@...r.kernel.org>, linux-scsi@...r.kernel.org,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH scsi] Short the path length of scsi_cmd_to_driver()

>>>>> "Li" == Li Zhong <zhong@...ux.vnet.ibm.com> writes:

> @@ -845,8 +844,11 @@ static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd,
> 
> 	scsi_eh_restore_cmnd(scmd, &ses);
> 
>-	if (sdrv && sdrv->eh_action)
>-		rtn = sdrv->eh_action(scmd, cmnd, cmnd_size, rtn);
>+	if (scmd->request->cmd_type == REQ_TYPE_FS) {
>+		struct scsi_driver *sdrv = scsi_cmd_to_driver(scmd);
>+		if (sdrv->eh_action)
>+			rtn = sdrv->eh_action(scmd, cmnd, cmnd_size, rtn);
>+	}
> 
> 	return rtn;
> }

My only concern is whether our device lifetime rules guarantee that the
ULD is always attached when we service an error handling command?

-- 
Martin K. Petersen	Oracle Linux Engineering
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