linux-kernel - RE: [PATCH 06/10] libata: use __scsi_format

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Date:	Fri, 14 Nov 2014 16:02:19 +0000
From:	"Elliott, Robert (Server Storage)" <Elliott@...com>
To:	Hannes Reinecke <hare@...e.de>,
	James Bottomley <jbottomley@...allels.com>
CC:	Christoph Hellwig <hch@...radead.org>,
	Ewan Milne <emilne@...hat.com>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 06/10] libata: use __scsi_format_command()



> -----Original Message-----
> From: Hannes Reinecke [mailto:hare@...e.de]
> Sent: Thursday, 06 November, 2014 2:31 AM
> To: James Bottomley
> Cc: Christoph Hellwig; Ewan Milne; Elliott, Robert (Server Storage);
> linux-scsi@...r.kernel.org; Hannes Reinecke; linux-
> ide@...r.kernel.org; LKML
> Subject: [PATCH 06/10] libata: use __scsi_format_command()
> 
> libata already uses an internal buffer, so we should be using
> __scsi_format_command() here.
> 
> Cc: linux-ide@...r.kernel.org
> Cc: LKML <linux-kernel@...r.kernel.org>
> Reviewed-by: Christoph Hellwig <hch@....de>
> Acked-by: Tejun Heo <tj@...nel.org>
> Signed-off-by: Hannes Reinecke <hare@...e.de>
> ---
>  drivers/ata/libata-eh.c | 13 +++++--------
>  1 file changed, 5 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
> index dad83df..6550a9a 100644
> --- a/drivers/ata/libata-eh.c
> +++ b/drivers/ata/libata-eh.c
> @@ -2509,15 +2509,12 @@ static void ata_eh_link_report(struct
> ata_link *link)
> 
>  		if (ata_is_atapi(qc->tf.protocol)) {
>  			if (qc->scsicmd)
> -				scsi_print_command(qc->scsicmd);
> +				__scsi_format_command(cdb_buf,
> sizeof(cdb_buf),
> +						      qc->scsicmd->cmnd,
> +						      qc->scsicmd->cmd_len);
>  			else
> -				snprintf(cdb_buf, sizeof(cdb_buf),
> -				 "cdb %02x %02x %02x %02x %02x %02x %02x
> %02x  "
> -				 "%02x %02x %02x %02x %02x %02x %02x %02x\n
> ",
> -				 cdb[0], cdb[1], cdb[2], cdb[3],
> -				 cdb[4], cdb[5], cdb[6], cdb[7],
> -				 cdb[8], cdb[9], cdb[10], cdb[11],
> -				 cdb[12], cdb[13], cdb[14], cdb[15]);
> +				__scsi_format_command(cdb_buf,
> sizeof(cdb_buf),
> +						      cdb, qc->dev->cdb_len);

Since results in just one "cdb" variable usage, you could change
"cdb" to qc->cdb" to get rid of the variable declaration and 
slightly simplify the code.
                const u8 *cdb = qc->cdb;


>  		} else {
>  			const char *descr = ata_get_cmd_descript(cmd-
> >command);
>  			if (descr)
> --
> 1.8.5.2

Reviewed-by: Robert Elliott <elliott@...com>

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