[ALSA] Fix 'semaphore is not ready' problem with snd-intel8x0m

Intel8x0-modem driver
With some intel based ac97 modems codec access semaphore is not cleared
after 0x54 AC97 register (GPIO_STATUS) reads. This may causes problems
with newly applied modem mixer (Off-hook switch) and in other cases.

Signed-off-by: Sasha Khapyorsky <sashak@smlink.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 2 insertions, 0 deletions

diff --git a/sound/pci/intel8x0m.c b/sound/pci/intel8x0m.c
index 67da096d659b..f9972b20050d 100644
--- a/sound/pci/intel8x0m.c
+++ b/sound/pci/intel8x0m.c
@@ -500,6 +500,8 @@ static unsigned short snd_intel8x0_codec_read(ac97_t *ac97,
                         res = 0xffff;
                 }
         }
+        if (reg == AC97_GPIO_STATUS)
+                iagetword(chip, 0); /* clear semaphore */
         return res;
 }