[PATCH] ALSA: Fix Oops of suspend/resume with generic drivers

The patch fixes Oops from sound drivers using generic platform device
but have no suspend/resume callbacks.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/sound/core/init.c b/sound/core/init.c
index a570201..c72a791 100644 (file)
--- a/sound/core/init.c
+++ b/sound/core/init.c
@@ -828,7 +828,8 @@ static int snd_generic_suspend(struct device *dev, pm_message_t state, u32 level
        card = get_snd_generic_card(dev);
        if (card->power_state == SNDRV_CTL_POWER_D3hot)
                return 0;
-       card->pm_suspend(card, PMSG_SUSPEND);
+       if (card->pm_suspend)
+               card->pm_suspend(card, PMSG_SUSPEND);
        snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
        return 0;
 }
@@ -843,7 +844,8 @@ static int snd_generic_resume(struct device *dev, u32 level)
        card = get_snd_generic_card(dev);
        if (card->power_state == SNDRV_CTL_POWER_D0)
                return 0;
-       card->pm_resume(card);
+       if (card->pm_suspend)
+               card->pm_resume(card);
        snd_power_change_state(card, SNDRV_CTL_POWER_D0);
        return 0;
 }