[ALSA] ac97 - NULL check in snd_ac97_suspend/resume

Modules: AC97 Codec

Add NULL check in snd_ac97_suspend() and snd_ac97_resume() so that
the caller doesn't have to do it by itself.

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

1 files changed, 5 insertions, 0 deletions

diff --git a/sound/pci/ac97/ac97_codec.c b/sound/pci/ac97/ac97_codec.c
index 9faeaefc8e6..abc83fa85bc 100644
--- a/sound/pci/ac97/ac97_codec.c
+++ b/sound/pci/ac97/ac97_codec.c
@@ -2186,6 +2186,8 @@ static void snd_ac97_powerdown(struct snd_ac97 *ac97)
  */
 void snd_ac97_suspend(struct snd_ac97 *ac97)
 {
+        if (! ac97)
+                return;
         if (ac97->build_ops->suspend)
                 ac97->build_ops->suspend(ac97);
         snd_ac97_powerdown(ac97);
@@ -2242,6 +2244,9 @@ void snd_ac97_resume(struct snd_ac97 *ac97)
 {
         unsigned long end_time;
 
+        if (! ac97)
+                return;
+
         if (ac97->bus->ops->reset) {
                 ac97->bus->ops->reset(ac97);
                 goto  __reset_ready;