ALSA: hda - Add pseudo device-locking for clear/reconfig

Added the pseudo device-locking using card->shutdown flag to avoid
the crash via clear/reconfig during operations.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 13 insertions, 2 deletions

diff --git a/sound/pci/hda/hda_hwdep.c b/sound/pci/hda/hda_hwdep.c
index c660383ef381..4af484b8240c 100644
--- a/sound/pci/hda/hda_hwdep.c
+++ b/sound/pci/hda/hda_hwdep.c
@@ -155,7 +155,13 @@ int /*__devinit*/ snd_hda_create_hwdep(struct hda_codec *codec)
 
 static int clear_codec(struct hda_codec *codec)
 {
-        snd_hda_codec_reset(codec);
+        int err;
+
+        err = snd_hda_codec_reset(codec);
+        if (err < 0) {
+                snd_printk(KERN_ERR "The codec is being used, can't free.\n");
+                return err;
+        }
         clear_hwdep_elements(codec);
         return 0;
 }
@@ -165,7 +171,12 @@ static int reconfig_codec(struct hda_codec *codec)
         int err;
 
         snd_printk(KERN_INFO "hda-codec: reconfiguring\n");
-        snd_hda_codec_reset(codec);
+        err = snd_hda_codec_reset(codec);
+        if (err < 0) {
+                snd_printk(KERN_ERR
+                           "The codec is being used, can't reconfigure.\n");
+                return err;
+        }
         err = snd_hda_codec_configure(codec);
         if (err < 0)
                 return err;