linux-kernel - Re: [PATCH] [libata] Fix HDIO_DRIVE

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Date:	Fri, 29 Mar 2013 17:10:56 +0100
From:	Krzysztof Mazur <krzysiek@...lesie.net>
To:	Gwendal Grignou <gwendal@...gle.com>
Cc:	ronald645@...il.com, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [libata] Fix HDIO_DRIVE_CMD ioctl sense data check

On Fri, Mar 29, 2013 at 08:26:41AM -0700, Gwendal Grignou wrote:
> commit 84a9a8cd9d0aa93c17e5815ab8a9cc4c0a765c63 changed the sense key
> used for returning task registers, but HDIO_DRIVE_CMD ioctl was
> not changed accordingly.
> 
> Tested: check that SMART ENABLE sent using HDIO_DRIVE_CMD returns 0
> instead of EIO.
> 
> Signed-off-by: Gwendal Grignou <gwendal@...gle.com>
> ---
>  drivers/ata/libata-scsi.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
> index 318b413..e05bf4c 100644
> --- a/drivers/ata/libata-scsi.c
> +++ b/drivers/ata/libata-scsi.c
> @@ -532,8 +532,8 @@ int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg)
>  			struct scsi_sense_hdr sshdr;
>  			scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
>  					     &sshdr);
> -			if (sshdr.sense_key == 0 &&
> -			    sshdr.asc == 0 && sshdr.ascq == 0)
> +			if (sshdr.sense_key == RECOVERED_ERROR &&
> +			    sshdr.asc == 0 && sshdr.ascq == 0x1D)
>  				cmd_result &= ~SAM_STAT_CHECK_CONDITION;
>  		}
>  
> -- 
> 1.8.1.3

I did not test your patch, but I think that you missed the second
test in ata_task_ioctl() and the kernel will still return -EIO
in case of HDIO_DRIVE_TASK (0x31e) ioctl.
See http://marc.info/?l=linux-kernel&m=136438868606981&w=2.
The version I've sent fixes the problem for me.

Krzysiek
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