linux-kernel - Re: [PATCH 5/8] scsi: fix TUR error handling in sr_media

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Date:	Thu, 09 Dec 2010 21:20:53 +0300
From:	Sergei Shtylyov <sshtylyov@...sta.com>
To:	Tejun Heo <tj@...nel.org>
CC:	jeff@...zik.org, linux-ide@...r.kernel.org, axboe@...nel.dk,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	kay.sievers@...y.org, jack@...e.cz,
	James.Bottomley@...senPartnership.com
Subject: Re: [PATCH 5/8] scsi: fix TUR error handling in sr_media_change()

Hello.

Tejun Heo wrote:

> sr_test_unit_ready() returns 0 iff TUR succeeded - IOW, when media is
> present and the device is actually ready, so the return value wouldn't
> be zero when TUR ends with sense data. sr_media_change() incorrectly
> tests (retval || (scsi_sense_valid(sshdr)...)) when it tries to test
> whether TUR failed without sense data or with sense data indicating
> media-not-present.

> Fix the test using scsi_status_is_good() and update comments.

> Signed-off-by: Tejun Heo <tj@...nel.org>
[...]

> diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
> index d7b383c..deb24f0 100644
> --- a/drivers/scsi/sr.c
> +++ b/drivers/scsi/sr.c
> @@ -214,13 +214,17 @@ static int sr_media_change(struct cdrom_device_info *cdi, int slot)
>  
>  	sshdr =  kzalloc(sizeof(*sshdr), GFP_KERNEL);
>  	retval = sr_test_unit_ready(cd->device, sshdr);
> -	if (retval || (scsi_sense_valid(sshdr) &&
> -		       /* 0x3a is medium not present */
> -		       sshdr->asc == 0x3a)) {
> -		/* Media not present or unable to test, unit probably not
> -		 * ready. This usually means there is no disc in the drive.
> -		 * Mark as changed, and we will figure it out later once
> -		 * the drive is available again.
> +	/*
> +	 * Media is considered to be present if TUR succeeds or fails with
> +	 * sense data indicating something other than media-not-present
> +	 * (ASC 0x3a).
> +	 */
> +	if (!scsi_status_is_good(retval) &&
> +	    (!scsi_sense_valid(sshdr) || sshdr->asc == 0x3a)) {
> +		/*
> +		 * Probably not media in the device.  Mark as changed, and

    s/not/no/

WBR, Sergei

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