linux-kernel - Re: [PATCH] libata: fixup oops in ata_eh_link

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Message-ID: <20150119143738.GA979@swordfish>
Date:	Mon, 19 Jan 2015 23:37:38 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:	Hannes Reinecke <hare@...e.de>
Cc:	Tejun Heo <tj@...nel.org>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Subject: Re: [PATCH] libata: fixup oops in ata_eh_link_report()

On (01/19/15 13:00), Hannes Reinecke wrote:
> Date: Mon, 19 Jan 2015 13:00:59 +0100
> From: Hannes Reinecke <hare@...e.de>
> To: Tejun Heo <tj@...nel.org>
> Cc: linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org, Sergey
>  Senozhatsky <sergey.senozhatsky@...il.com>, Hannes Reinecke <hare@...e.de>
> Subject: [PATCH] libata: fixup oops in ata_eh_link_report()
> X-Mailer: git-send-email 1.8.5.2
> 
> We should only try to evaluate the cdb if this is an ATAPI
> device, for any other device the 'cdb' field and the cdb_len
> has no meaning.
> 
> Signed-off-by: Hannes Reinecke <hare@...e.de>
> ---
>  drivers/ata/libata-eh.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
> index 9179f11..584c6ae 100644
> --- a/drivers/ata/libata-eh.c
> +++ b/drivers/ata/libata-eh.c
> @@ -2481,8 +2481,6 @@ static void ata_eh_link_report(struct ata_link *link)
>  	for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
>  		struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
>  		struct ata_taskfile *cmd = &qc->tf, *res = &qc->result_tf;
> -		const u8 *cdb = qc->cdb;
> -		size_t cdb_len = qc->dev->cdb_len;
>  		char data_buf[20] = "";
>  		char cdb_buf[70] = "";
>  
> @@ -2510,6 +2508,9 @@ static void ata_eh_link_report(struct ata_link *link)
>  		}
>  
>  		if (ata_is_atapi(qc->tf.protocol)) {
> +			const u8 *cdb = qc->cdb;
> +			size_t cdb_len = qd->dev->cdb_len;

I think, it supposed to be qc, not qd.


	-ss

>  			if (qc->scsicmd) {
>  				cdb = qc->scsicmd->cmnd;
>  				cdb_len = qc->scsicmd->cmd_len;
> -- 
> 1.8.5.2
> 
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