diff --git a/sound/core/oss/mixer_oss.c b/sound/core/oss/mixer_oss.c
index f50ebf2..86afb13c 100644
--- a/sound/core/oss/mixer_oss.c
+++ b/sound/core/oss/mixer_oss.c
@@ -77,7 +77,7 @@
 	struct snd_mixer_oss_file *fmixer;
 
 	if (file->private_data) {
-		fmixer = (struct snd_mixer_oss_file *) file->private_data;
+		fmixer = file->private_data;
 		module_put(fmixer->card->module);
 		snd_card_file_remove(fmixer->card, file);
 		kfree(fmixer);
@@ -368,7 +368,7 @@
 
 static long snd_mixer_oss_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
-	return snd_mixer_oss_ioctl1((struct snd_mixer_oss_file *) file->private_data, cmd, arg);
+	return snd_mixer_oss_ioctl1(file->private_data, cmd, arg);
 }
 
 int snd_mixer_oss_ioctl_card(struct snd_card *card, unsigned int cmd, unsigned long arg)
@@ -582,7 +582,7 @@
 				     struct snd_mixer_oss_slot *pslot,
 				     int *left, int *right)
 {
-	struct slot *slot = (struct slot *)pslot->private_data;
+	struct slot *slot = pslot->private_data;
 	
 	*left = *right = 100;
 	if (slot->present & SNDRV_MIXER_OSS_PRESENT_PVOLUME) {
@@ -691,7 +691,7 @@
 				     struct snd_mixer_oss_slot *pslot,
 				     int left, int right)
 {
-	struct slot *slot = (struct slot *)pslot->private_data;
+	struct slot *slot = pslot->private_data;
 	
 	if (slot->present & SNDRV_MIXER_OSS_PRESENT_PVOLUME) {
 		snd_mixer_oss_put_volume1_vol(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_PVOLUME], left, right);
@@ -740,7 +740,7 @@
 					struct snd_mixer_oss_slot *pslot,
 					int *active)
 {
-	struct slot *slot = (struct slot *)pslot->private_data;
+	struct slot *slot = pslot->private_data;
 	int left, right;
 	
 	left = right = 1;
@@ -753,7 +753,7 @@
 					   struct snd_mixer_oss_slot *pslot,
 					   int *active)
 {
-	struct slot *slot = (struct slot *)pslot->private_data;
+	struct slot *slot = pslot->private_data;
 	int left, right;
 	
 	left = right = 1;
@@ -766,7 +766,7 @@
 					struct snd_mixer_oss_slot *pslot,
 					int active)
 {
-	struct slot *slot = (struct slot *)pslot->private_data;
+	struct slot *slot = pslot->private_data;
 	
 	snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_CSWITCH], active, active, 0);
 	return 0;
@@ -776,7 +776,7 @@
 					   struct snd_mixer_oss_slot *pslot,
 					   int active)
 {
-	struct slot *slot = (struct slot *)pslot->private_data;
+	struct slot *slot = pslot->private_data;
 	
 	snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_CROUTE], active, active, 1);
 	return 0;
@@ -813,7 +813,7 @@
 		if (!(mixer->mask_recsrc & (1 << idx)))
 			continue;
 		pslot = &mixer->slots[idx];
-		slot = (struct slot *)pslot->private_data;
+		slot = pslot->private_data;
 		if (slot->signature != SNDRV_MIXER_OSS_SIGNATURE)
 			continue;
 		if (!(slot->present & SNDRV_MIXER_OSS_PRESENT_CAPTURE))
@@ -861,7 +861,7 @@
 		if (!(mixer->mask_recsrc & (1 << idx)))
 			continue;
 		pslot = &mixer->slots[idx];
-		slot = (struct slot *)pslot->private_data;
+		slot = pslot->private_data;
 		if (slot->signature != SNDRV_MIXER_OSS_SIGNATURE)
 			continue;
 		if (!(slot->present & SNDRV_MIXER_OSS_PRESENT_CAPTURE))
@@ -925,7 +925,7 @@
 
 static void snd_mixer_oss_slot_free(struct snd_mixer_oss_slot *chn)
 {
-	struct slot *p = (struct slot *)chn->private_data;
+	struct slot *p = chn->private_data;
 	if (p) {
 		if (p->allocated && p->assigned) {
 			kfree(p->assigned->name);
diff --git a/sound/core/pcm.c b/sound/core/pcm.c
index 204af48..88525a9 100644
--- a/sound/core/pcm.c
+++ b/sound/core/pcm.c
@@ -364,8 +364,7 @@
 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
 					     struct snd_info_buffer *buffer)
 {
-	snd_pcm_proc_info_read((struct snd_pcm_substream *)entry->private_data,
-			       buffer);
+	snd_pcm_proc_info_read(entry->private_data, buffer);
 }
 
 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
diff --git a/sound/drivers/virmidi.c b/sound/drivers/virmidi.c
index 0e631c3..f4cd493 100644
--- a/sound/drivers/virmidi.c
+++ b/sound/drivers/virmidi.c
@@ -94,7 +94,7 @@
 			      sizeof(struct snd_card_virmidi), &card);
 	if (err < 0)
 		return err;
-	vmidi = (struct snd_card_virmidi *)card->private_data;
+	vmidi = card->private_data;
 	vmidi->card = card;
 
 	if (midi_devs[dev] > MAX_MIDI_DEVICES) {
diff --git a/sound/i2c/other/ak4xxx-adda.c b/sound/i2c/other/ak4xxx-adda.c
index 1adb8a3..ebab6c7 100644
--- a/sound/i2c/other/ak4xxx-adda.c
+++ b/sound/i2c/other/ak4xxx-adda.c
@@ -878,7 +878,7 @@
 static void proc_regs_read(struct snd_info_entry *entry,
 		struct snd_info_buffer *buffer)
 {
-	struct snd_akm4xxx *ak = (struct snd_akm4xxx *)entry->private_data;
+	struct snd_akm4xxx *ak = entry->private_data;
 	int reg, val, chip;
 	for (chip = 0; chip < ak->num_chips; chip++) {
 		for (reg = 0; reg < ak->total_regs; reg++) {
diff --git a/sound/isa/ad1816a/ad1816a.c b/sound/isa/ad1816a/ad1816a.c
index bbcbf92..3cb75bc 100644
--- a/sound/isa/ad1816a/ad1816a.c
+++ b/sound/isa/ad1816a/ad1816a.c
@@ -162,7 +162,7 @@
 				sizeof(struct snd_card_ad1816a), &card);
 	if (error < 0)
 		return error;
-	acard = (struct snd_card_ad1816a *)card->private_data;
+	acard = card->private_data;
 
 	if ((error = snd_card_ad1816a_pnp(dev, acard, pcard, pid))) {
 		snd_card_free(card);
diff --git a/sound/isa/azt2320.c b/sound/isa/azt2320.c
index f7aa637..aac8dc1 100644
--- a/sound/isa/azt2320.c
+++ b/sound/isa/azt2320.c
@@ -188,7 +188,7 @@
 				sizeof(struct snd_card_azt2320), &card);
 	if (error < 0)
 		return error;
-	acard = (struct snd_card_azt2320 *)card->private_data;
+	acard = card->private_data;
 
 	if ((error = snd_card_azt2320_pnp(dev, acard, pcard, pid))) {
 		snd_card_free(card);
diff --git a/sound/isa/gus/gusmax.c b/sound/isa/gus/gusmax.c
index f26eac8..3e4a58b 100644
--- a/sound/isa/gus/gusmax.c
+++ b/sound/isa/gus/gusmax.c
@@ -191,7 +191,7 @@
 
 static void snd_gusmax_free(struct snd_card *card)
 {
-	struct snd_gusmax *maxcard = (struct snd_gusmax *)card->private_data;
+	struct snd_gusmax *maxcard = card->private_data;
 	
 	if (maxcard == NULL)
 		return;
@@ -219,7 +219,7 @@
 	if (err < 0)
 		return err;
 	card->private_free = snd_gusmax_free;
-	maxcard = (struct snd_gusmax *)card->private_data;
+	maxcard = card->private_data;
 	maxcard->card = card;
 	maxcard->irq = -1;
 	
diff --git a/sound/isa/sb/sb8.c b/sound/isa/sb/sb8.c
index 81284a8..2259e3f 100644
--- a/sound/isa/sb/sb8.c
+++ b/sound/isa/sb/sb8.c
@@ -72,7 +72,7 @@
 
 static void snd_sb8_free(struct snd_card *card)
 {
-	struct snd_sb8 *acard = (struct snd_sb8 *)card->private_data;
+	struct snd_sb8 *acard = card->private_data;
 
 	if (acard == NULL)
 		return;
diff --git a/sound/oss/au1550_ac97.c b/sound/oss/au1550_ac97.c
index c6f2621..8a12621 100644
--- a/sound/oss/au1550_ac97.c
+++ b/sound/oss/au1550_ac97.c
@@ -171,7 +171,7 @@
 static u16
 rdcodec(struct ac97_codec *codec, u8 addr)
 {
-	struct au1550_state *s = (struct au1550_state *)codec->private_data;
+	struct au1550_state *s = codec->private_data;
 	unsigned long   flags;
 	u32             cmd, val;
 	u16             data;
@@ -239,7 +239,7 @@
 static void
 wrcodec(struct ac97_codec *codec, u8 addr, u16 data)
 {
-	struct au1550_state *s = (struct au1550_state *)codec->private_data;
+	struct au1550_state *s = codec->private_data;
 	unsigned long   flags;
 	u32             cmd, val;
 	int             i;
@@ -820,7 +820,7 @@
 static long
 au1550_ioctl_mixdev(struct file *file, unsigned int cmd, unsigned long arg)
 {
-	struct au1550_state *s = (struct au1550_state *)file->private_data;
+	struct au1550_state *s = file->private_data;
 	struct ac97_codec *codec = s->codec;
 	int ret;
 
@@ -1031,7 +1031,7 @@
 static ssize_t
 au1550_read(struct file *file, char *buffer, size_t count, loff_t *ppos)
 {
-	struct au1550_state *s = (struct au1550_state *)file->private_data;
+	struct au1550_state *s = file->private_data;
 	struct dmabuf  *db = &s->dma_adc;
 	DECLARE_WAITQUEUE(wait, current);
 	ssize_t         ret;
@@ -1111,7 +1111,7 @@
 static ssize_t
 au1550_write(struct file *file, const char *buffer, size_t count, loff_t * ppos)
 {
-	struct au1550_state *s = (struct au1550_state *)file->private_data;
+	struct au1550_state *s = file->private_data;
 	struct dmabuf  *db = &s->dma_dac;
 	DECLARE_WAITQUEUE(wait, current);
 	ssize_t         ret = 0;
@@ -1211,7 +1211,7 @@
 static unsigned int
 au1550_poll(struct file *file, struct poll_table_struct *wait)
 {
-	struct au1550_state *s = (struct au1550_state *)file->private_data;
+	struct au1550_state *s = file->private_data;
 	unsigned long   flags;
 	unsigned int    mask = 0;
 
@@ -1250,7 +1250,7 @@
 static int
 au1550_mmap(struct file *file, struct vm_area_struct *vma)
 {
-	struct au1550_state *s = (struct au1550_state *)file->private_data;
+	struct au1550_state *s = file->private_data;
 	struct dmabuf  *db;
 	unsigned long   size;
 	int ret = 0;
@@ -1342,7 +1342,7 @@
 static int
 au1550_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
-	struct au1550_state *s = (struct au1550_state *)file->private_data;
+	struct au1550_state *s = file->private_data;
 	unsigned long   flags;
 	audio_buf_info  abinfo;
 	count_info      cinfo;
@@ -1868,7 +1868,7 @@
 static int
 au1550_release(struct inode *inode, struct file *file)
 {
-	struct au1550_state *s = (struct au1550_state *)file->private_data;
+	struct au1550_state *s = file->private_data;
 
 	lock_kernel();
 
diff --git a/sound/pci/emu10k1/emumpu401.c b/sound/pci/emu10k1/emumpu401.c
index 8578c70..bab5648 100644
--- a/sound/pci/emu10k1/emumpu401.c
+++ b/sound/pci/emu10k1/emumpu401.c
@@ -321,7 +321,7 @@
 
 static void snd_emu10k1_midi_free(struct snd_rawmidi *rmidi)
 {
-	struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)rmidi->private_data;
+	struct snd_emu10k1_midi *midi = rmidi->private_data;
 	midi->interrupt = NULL;
 	midi->rmidi = NULL;
 }
diff --git a/sound/pci/ice1712/pontis.c b/sound/pci/ice1712/pontis.c
index 6bc3f91..cdb873f 100644
--- a/sound/pci/ice1712/pontis.c
+++ b/sound/pci/ice1712/pontis.c
@@ -638,7 +638,7 @@
  */
 static void wm_proc_regs_write(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
 {
-	struct snd_ice1712 *ice = (struct snd_ice1712 *)entry->private_data;
+	struct snd_ice1712 *ice = entry->private_data;
 	char line[64];
 	unsigned int reg, val;
 	mutex_lock(&ice->gpio_mutex);
@@ -653,7 +653,7 @@
 
 static void wm_proc_regs_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
 {
-	struct snd_ice1712 *ice = (struct snd_ice1712 *)entry->private_data;
+	struct snd_ice1712 *ice = entry->private_data;
 	int reg, val;
 
 	mutex_lock(&ice->gpio_mutex);
@@ -676,7 +676,7 @@
 
 static void cs_proc_regs_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
 {
-	struct snd_ice1712 *ice = (struct snd_ice1712 *)entry->private_data;
+	struct snd_ice1712 *ice = entry->private_data;
 	int reg, val;
 
 	mutex_lock(&ice->gpio_mutex);
diff --git a/sound/pci/ice1712/prodigy192.c b/sound/pci/ice1712/prodigy192.c
index 2a8e5cd..e36ddb9 100644
--- a/sound/pci/ice1712/prodigy192.c
+++ b/sound/pci/ice1712/prodigy192.c
@@ -654,7 +654,7 @@
 static void stac9460_proc_regs_read(struct snd_info_entry *entry,
 		struct snd_info_buffer *buffer)
 {
-	struct snd_ice1712 *ice = (struct snd_ice1712 *)entry->private_data;
+	struct snd_ice1712 *ice = entry->private_data;
 	int reg, val;
 	/* registers 0x0 - 0x14 */
 	for (reg = 0; reg <= 0x15; reg++) {
diff --git a/sound/pci/rme96.c b/sound/pci/rme96.c
index d19dc05..d5f5b44 100644
--- a/sound/pci/rme96.c
+++ b/sound/pci/rme96.c
@@ -1527,14 +1527,14 @@
 static void
 snd_rme96_free_spdif_pcm(struct snd_pcm *pcm)
 {
-	struct rme96 *rme96 = (struct rme96 *) pcm->private_data;
+	struct rme96 *rme96 = pcm->private_data;
 	rme96->spdif_pcm = NULL;
 }
 
 static void
 snd_rme96_free_adat_pcm(struct snd_pcm *pcm)
 {
-	struct rme96 *rme96 = (struct rme96 *) pcm->private_data;
+	struct rme96 *rme96 = pcm->private_data;
 	rme96->adat_pcm = NULL;
 }
 
@@ -1661,7 +1661,7 @@
 snd_rme96_proc_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
 {
 	int n;
-	struct rme96 *rme96 = (struct rme96 *)entry->private_data;
+	struct rme96 *rme96 = entry->private_data;
 	
 	rme96->rcreg = readl(rme96->iobase + RME96_IO_CONTROL_REGISTER);
 
@@ -2348,7 +2348,7 @@
 	if (err < 0)
 		return err;
 	card->private_free = snd_rme96_card_free;
-	rme96 = (struct rme96 *)card->private_data;	
+	rme96 = card->private_data;
 	rme96->card = card;
 	rme96->pci = pci;
 	snd_card_set_dev(card, &pci->dev);
diff --git a/sound/pci/rme9652/hdsp.c b/sound/pci/rme9652/hdsp.c
index b92adef..599e090 100644
--- a/sound/pci/rme9652/hdsp.c
+++ b/sound/pci/rme9652/hdsp.c
@@ -3284,7 +3284,7 @@
 static void
 snd_hdsp_proc_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
 {
-	struct hdsp *hdsp = (struct hdsp *) entry->private_data;
+	struct hdsp *hdsp = entry->private_data;
 	unsigned int status;
 	unsigned int status2;
 	char *pref_sync_ref;
@@ -4566,7 +4566,7 @@
 
 static int snd_hdsp_hwdep_ioctl(struct snd_hwdep *hw, struct file *file, unsigned int cmd, unsigned long arg)
 {
-	struct hdsp *hdsp = (struct hdsp *)hw->private_data;
+	struct hdsp *hdsp = hw->private_data;
 	void __user *argp = (void __user *)arg;
 	int err;
 
@@ -5155,7 +5155,7 @@
 
 static void snd_hdsp_card_free(struct snd_card *card)
 {
-	struct hdsp *hdsp = (struct hdsp *) card->private_data;
+	struct hdsp *hdsp = card->private_data;
 
 	if (hdsp)
 		snd_hdsp_free(hdsp);
@@ -5181,7 +5181,7 @@
 	if (err < 0)
 		return err;
 
-	hdsp = (struct hdsp *) card->private_data;
+	hdsp = card->private_data;
 	card->private_free = snd_hdsp_card_free;
 	hdsp->dev = dev;
 	hdsp->pci = pci;