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cdrom: respect device capabilities during opening action

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[ Upstream commit 366ba7c71ef77c08d06b18ad61b26e2df7352338 ]

Reading the TOC only works if the device can play audio, otherwise
these commands fail (and possibly bring the device to an unhealthy
state.)

Similarly, cdrom_mmc3_profile() should only be called if the device
supports generic packet commands.

To: Jens Axboe <axboe@kernel.dk>
Cc: linux-kernel@vger.kernel.org
Cc: linux-scsi@vger.kernel.org
Signed-off-by: Diego Elio Pettenò <flameeyes@flameeyes.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Diego Elio Pettenò 2019-11-19 21:37:08 +00:00 committed by Greg Kroah-Hartman
parent 4c45e9ed24
commit 7739bc1e0e
1 changed files with 11 additions and 1 deletions
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12
drivers/cdrom/cdrom.c
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@ -996,6 +996,12 @@ static void cdrom_count_tracks(struct cdrom_device_info *cdi, tracktype *tracks)
tracks->xa = 0;
tracks->error = 0;
cd_dbg(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 */
ret = cdi->ops->audio_ioctl(cdi, CDROMREADTOCHDR, &header);
if (ret) {
@ -1162,7 +1168,8 @@ int cdrom_open(struct cdrom_device_info *cdi, struct block_device *bdev,
ret = open_for_data(cdi);
if (ret)
goto err;
cdrom_mmc3_profile(cdi);
if (CDROM_CAN(CDC_GENERIC_PACKET))
cdrom_mmc3_profile(cdi);
if (mode & FMODE_WRITE) {
ret = -EROFS;
if (cdrom_open_write(cdi))
@ -2882,6 +2889,9 @@ int cdrom_get_last_written(struct cdrom_device_info *cdi, long *last_written)
it doesn't give enough information or fails. then we return
the toc contents. */
use_toc:
if (!CDROM_CAN(CDC_PLAY_AUDIO))
return -ENOSYS;
toc.cdte_format = CDROM_MSF;
toc.cdte_track = CDROM_LEADOUT;
if ((ret = cdi->ops->audio_ioctl(cdi, CDROMREADTOCENTRY, &toc)))