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path: root/drivers/cdrom/cdrom.c
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Diffstat (limited to 'drivers/cdrom/cdrom.c')
-rw-r--r--drivers/cdrom/cdrom.c19
1 files changed, 14 insertions, 5 deletions
diff --git a/drivers/cdrom/cdrom.c b/drivers/cdrom/cdrom.c
index ff4280800cd0..782dbab5ad56 100644
--- a/drivers/cdrom/cdrom.c
+++ b/drivers/cdrom/cdrom.c
@@ -265,6 +265,7 @@
/* #define ERRLOGMASK (CD_WARNING|CD_OPEN|CD_COUNT_TRACKS|CD_CLOSE) */
/* #define ERRLOGMASK (CD_WARNING|CD_REG_UNREG|CD_DO_IOCTL|CD_OPEN|CD_CLOSE|CD_COUNT_TRACKS) */
+#include <linux/atomic.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/major.h>
@@ -997,6 +998,12 @@ 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) {
@@ -1163,7 +1170,8 @@ 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))
@@ -2872,6 +2880,9 @@ 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)))
@@ -3683,9 +3694,9 @@ static struct ctl_table_header *cdrom_sysctl_header;
static void cdrom_sysctl_register(void)
{
- static int initialized;
+ static atomic_t initialized = ATOMIC_INIT(0);
- if (initialized == 1)
+ if (!atomic_add_unless(&initialized, 1, 1))
return;
cdrom_sysctl_header = register_sysctl_table(cdrom_root_table);
@@ -3696,8 +3707,6 @@ static void cdrom_sysctl_register(void)
cdrom_sysctl_settings.debug = debug;
cdrom_sysctl_settings.lock = lockdoor;
cdrom_sysctl_settings.check = check_media_type;
-
- initialized = 1;
}
static void cdrom_sysctl_unregister(void)