gdrom: add dummy audio_ioctl handler

Make sure audio_ioctl is always defined even if being a dummy function
since the cdrom_ioctl interface assumes its existence and we don't
want to BUG on null ptr on some ioctls like, e.g. CDROMREADTOCENTRY,
CDROMREADTOCHDR etc. when we fix CDC_PLAY_AUDIO checking in cdrom.c.

Signed-off-by: Borislav Petkov <petkovbb@gmail.com>
Acked-by: Adrian McMenamin <adrian@mcmen.demon.co.uk>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/cdrom/gdrom.c b/drivers/cdrom/gdrom.c
index 1e0455bd6df9..1231d95aa695 100644
--- a/drivers/cdrom/gdrom.c
+++ b/drivers/cdrom/gdrom.c
@@ -471,6 +471,12 @@ cleanup_sense_final:
         return err;
 }
 
+static int gdrom_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,
+                             void *arg)
+{
+        return -EINVAL;
+}
+
 static struct cdrom_device_ops gdrom_ops = {
         .open                   = gdrom_open,
         .release                = gdrom_release,
@@ -478,6 +484,7 @@ static struct cdrom_device_ops gdrom_ops = {
         .media_changed          = gdrom_mediachanged,
         .get_last_session       = gdrom_get_last_session,
         .reset                  = gdrom_hardreset,
+        .audio_ioctl            = gdrom_audio_ioctl,
         .capability             = CDC_MULTI_SESSION | CDC_MEDIA_CHANGED |
                                   CDC_RESET | CDC_DRIVE_STATUS | CDC_CD_R,
         .n_minors               = 1,