linux-kernel - Re: [PATCH] cdrom: don't check CDC_PLAY_AUDIO in cdrom_count

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Message-ID: <20080617080647.GD20851@kernel.dk>
Date:	Tue, 17 Jun 2008 10:06:47 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	IDE/ATA development list <linux-ide@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Subject: Re: [PATCH] cdrom: don't check CDC_PLAY_AUDIO in cdrom_count_tracks()

On Tue, Jun 17 2008, Tejun Heo wrote:
> According to MMC-3 (or any later versions) READ TOCs are mandatory
> commands and have nothing to do with CDC_PLAY_AUDIO.  I have no idea
> why the check was put there in the first place but it now only breaks
> automatic actions on certain drives.
> 
> Note that this test was only effective when ide-cdrom was being used
> as sr didn't mask CDC_PLAY_AUDIO according to the capabilities.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>

Acked-by: Jens Axboe <jens.axboe@...cle.com>

> ---
>  drivers/cdrom/cdrom.c |    4 ----
>  1 file changed, 4 deletions(-)
> 
> diff --git a/drivers/cdrom/cdrom.c b/drivers/cdrom/cdrom.c
> index 69f26eb..11574c5 100644
> --- a/drivers/cdrom/cdrom.c
> +++ b/drivers/cdrom/cdrom.c
> @@ -1491,10 +1491,6 @@ static void cdrom_count_tracks(struct cdrom_device_info *cdi, tracktype* tracks)
>  	tracks->xa=0;
>  	tracks->error=0;
>  	cdinfo(CD_COUNT_TRACKS, "entering cdrom_count_tracks\n"); 
> -        if (!CDROM_CAN(CDC_PLAY_AUDIO)) { 
> -                tracks->error=CDS_NO_INFO;
> -                return;
> -        }        
>  	/* Grab the TOC header so we can see how many tracks there are */
>  	if ((ret = cdi->ops->audio_ioctl(cdi, CDROMREADTOCHDR, &header))) {
>  		if (ret == -ENOMEDIUM)

-- 
Jens Axboe

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