em28xx: don't load audio modules when AC97 is mis-detected

With em2800 hardware, AC97 hardware can be detected even when it doesn't
exist. If, after probing for AC97, the driver won't find a companion
chip, simply prevents the load of the audio modules.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/drivers/media/video/em28xx/em28xx-core.c b/drivers/media/video/em28xx/em28xx-core.c
index 33586004eb4..3f86d36dff2 100644
--- a/drivers/media/video/em28xx/em28xx-core.c
+++ b/drivers/media/video/em28xx/em28xx-core.c
@@ -533,8 +533,15 @@ int em28xx_audio_setup(struct em28xx *dev)
 
         vid1 = em28xx_read_ac97(dev, AC97_VENDOR_ID1);
         if (vid1 < 0) {
-                /* Device likely doesn't support AC97 */
+                /*
+                 * Device likely doesn't support AC97
+                 * Note: (some) em2800 devices without eeprom reports 0x91 on
+                 *       CHIPCFG register, even not having an AC97 chip
+                 */
                 em28xx_warn("AC97 chip type couldn't be determined\n");
+                dev->audio_mode.ac97 = EM28XX_NO_AC97;
+                dev->has_alsa_audio = 0;
+                dev->audio_mode.has_audio = 0;
                 goto init_audio;
         }