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cdrom: handle TOC

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This patch should fix TOC handling for cdroms that can not play audio.  It
extends commit af744e3294 ("cdrom: don't
check CDC_PLAY_AUDIO in cdrom_count_tracks()") with a safety check and
non-audio ioctls support.

Since CDC_PLAY_AUDIO flag was used not only to check ability to play audio
but also to ensure that audio_ioctl was not NULL, all TOC-related
operations had to use it.

As far as I understand, now audio_ioctl is never NULL, so a sanity check
during device registration should be sufficient.

It was tested on Optiarc AD7203A device, that has no ability to play
audio.

Cc: Tejun Heo <tj@kernel.org>
Cc: Jens Axboe <jens.axboe@oracle.com>
Cc: Borislav Petkov <petkovbb@googlemail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
[bart: remove now unneeded ->audio_ioctl check (noticed by Borislav)]
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Alexander Inyukhin 2008-08-18 21:40:04 +02:00 committed by Bartlomiej Zolnierkiewicz
parent d15cad5df1
commit bce31b6748
1 changed files with 0 additions and 7 deletions
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7
drivers/cdrom/cdrom.c
View file

@ -408,7 +408,6 @@ int register_cdrom(struct cdrom_device_info *cdi)
ENSURE(get_last_session, CDC_MULTI_SESSION);
ENSURE(get_mcn, CDC_MCN);
ENSURE(reset, CDC_RESET);
ENSURE(audio_ioctl, CDC_PLAY_AUDIO);
ENSURE(generic_packet, CDC_GENERIC_PACKET);
cdi->mc_flags = 0;
cdo->n_minors = 0;
@ -2506,8 +2505,6 @@ static int cdrom_ioctl_get_subchnl(struct cdrom_device_info *cdi,
/* cdinfo(CD_DO_IOCTL,"entering CDROMSUBCHNL\n");*/
if (!CDROM_CAN(CDC_PLAY_AUDIO))
return -ENOSYS;
if (copy_from_user(&q, argp, sizeof(q)))
return -EFAULT;
@ -2538,8 +2535,6 @@ static int cdrom_ioctl_read_tochdr(struct cdrom_device_info *cdi,
/* cdinfo(CD_DO_IOCTL, "entering CDROMREADTOCHDR\n"); */
if (!CDROM_CAN(CDC_PLAY_AUDIO))
return -ENOSYS;
if (copy_from_user(&header, argp, sizeof(header)))
return -EFAULT;
@ -2562,8 +2557,6 @@ static int cdrom_ioctl_read_tocentry(struct cdrom_device_info *cdi,
/* cdinfo(CD_DO_IOCTL, "entering CDROMREADTOCENTRY\n"); */
if (!CDROM_CAN(CDC_PLAY_AUDIO))
return -ENOSYS;
if (copy_from_user(&entry, argp, sizeof(entry)))
return -EFAULT;