From: "Diego Elio Pettenò" <flameeyes@flameeyes.com>
To: Jens Axboe <axboe@kernel.dk>
Cc: "Diego Elio Pettenò" <flameeyes@flameeyes.com>,
linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org
Subject: [PATCH 1/2] cdrom: respect device capabilities during opening action
Date: Tue, 19 Nov 2019 21:37:08 +0000 [thread overview]
Message-ID: <20191119213709.10900-1-flameeyes@flameeyes.com> (raw)
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>
---
drivers/cdrom/cdrom.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/drivers/cdrom/cdrom.c b/drivers/cdrom/cdrom.c
index ac42ae4651ce..eebdcbef0578 100644
--- a/drivers/cdrom/cdrom.c
+++ b/drivers/cdrom/cdrom.c
@@ -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)))
--
2.23.0
next reply other threads:[~2019-11-19 21:37 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-19 21:37 Diego Elio Pettenò [this message]
2019-11-19 21:37 ` [PATCH 2/2] sr_vendor: support Beurer GL50 evo CD-on-a-chip devices Diego Elio Pettenò
2019-11-26 20:02 ` [PATCH 1/2] cdrom: respect device capabilities during opening action Jens Axboe
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