[ALSA] remove redundent assignment to the ac97 device structure

AC97 Codec
Don't use dev.platform_data to store a reference to the containing
ac97_t structure.  Such assignment is redundent since we can deduce the
ac97_t structure location from the contained device structure.  This
sets platform_data free for other purposes.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

2 files changed, 2 insertions, 1 deletions

diff --git a/include/sound/ac97_codec.h b/include/sound/ac97_codec.h
index 2857cf0472df..d11f34832a97 100644
--- a/include/sound/ac97_codec.h
+++ b/include/sound/ac97_codec.h
@@ -527,6 +527,8 @@ struct _snd_ac97 {
         struct device dev;
 };
 
+#define to_ac97_t(d) container_of(d, struct _snd_ac97, dev)
+
 /* conditions */
 static inline int ac97_is_audio(ac97_t * ac97)
 {
diff --git a/sound/pci/ac97/ac97_codec.c b/sound/pci/ac97/ac97_codec.c
index f221eba5c32f..41fc290149ed 100644
--- a/sound/pci/ac97/ac97_codec.c
+++ b/sound/pci/ac97/ac97_codec.c
@@ -1828,7 +1828,6 @@ static int snd_ac97_dev_register(snd_device_t *device)
 
         ac97->dev.bus = &ac97_bus_type;
         ac97->dev.parent = ac97->bus->card->dev;
-        ac97->dev.platform_data = ac97;
         ac97->dev.release = ac97_device_release;
         snprintf(ac97->dev.bus_id, BUS_ID_SIZE, "card%d-%d", ac97->bus->card->number, ac97->num);
         if ((err = device_register(&ac97->dev)) < 0) {