[ALSA] Remove redundant NULL checks before kfree

Timer Midlevel,ALSA sequencer,ALSA<-OSS sequencer,Digigram VX core
I2C tea6330t,GUS Library,VIA82xx driver,VIA82xx-modem driver
CA0106 driver,CS46xx driver,EMU10K1/EMU10K2 driver,YMFPCI driver
Digigram VX Pocket driver,Common EMU synth,USB generic driver,USB USX2Y
Checking a pointer for NULL before calling kfree() on it is redundant,
kfree() deals with NULL pointers just fine.
This patch removes such checks from sound/

This patch also makes another, but closely related, change.
It avoids casting pointers about to be kfree()'ed.

Signed-off-by: Jesper Juhl <juhl-lkml@dif.dk>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

7 files changed, 9 insertions, 25 deletions

diff --git a/sound/pci/ca0106/ca0106_main.c b/sound/pci/ca0106/ca0106_main.c
index 85caf1b..0ec0c3e 100644
--- a/sound/pci/ca0106/ca0106_main.c
+++ b/sound/pci/ca0106/ca0106_main.c
@@ -332,11 +332,7 @@ static void snd_ca0106_intr_enable(ca0106_t *emu, unsigned int intrenb)
 
 static void snd_ca0106_pcm_free_substream(snd_pcm_runtime_t *runtime)
 {
-	ca0106_pcm_t *epcm = runtime->private_data;
-  
-	if (epcm) {
-		kfree(epcm);
-	}
+	kfree(runtime->private_data);
 }
 
 /* open_playback callback */
diff --git a/sound/pci/cs46xx/cs46xx_lib.c b/sound/pci/cs46xx/cs46xx_lib.c
index 5f2ffb7..fd4c50c 100644
--- a/sound/pci/cs46xx/cs46xx_lib.c
+++ b/sound/pci/cs46xx/cs46xx_lib.c
@@ -1295,8 +1295,7 @@ static snd_pcm_hw_constraint_list_t hw_constraints_period_sizes = {
 
 static void snd_cs46xx_pcm_free_substream(snd_pcm_runtime_t *runtime)
 {
-	cs46xx_pcm_t * cpcm = runtime->private_data;
-	kfree(cpcm);
+	kfree(runtime->private_data);
 }
 
 static int _cs46xx_playback_open_channel (snd_pcm_substream_t * substream,int pcm_channel_id)
diff --git a/sound/pci/emu10k1/emu10k1x.c b/sound/pci/emu10k1/emu10k1x.c
index f8d9233..e90c5ddd 100644
--- a/sound/pci/emu10k1/emu10k1x.c
+++ b/sound/pci/emu10k1/emu10k1x.c
@@ -361,10 +361,7 @@ static void snd_emu10k1x_gpio_write(emu10k1x_t *emu, unsigned int value)
 
 static void snd_emu10k1x_pcm_free_substream(snd_pcm_runtime_t *runtime)
 {
-	emu10k1x_pcm_t *epcm = runtime->private_data;
-  
-	if (epcm)
-		kfree(epcm);
+	kfree(runtime->private_data);
 }
 
 static void snd_emu10k1x_pcm_interrupt(emu10k1x_t *emu, emu10k1x_voice_t *voice)
diff --git a/sound/pci/emu10k1/emupcm.c b/sound/pci/emu10k1/emupcm.c
index fd7cc38..520b99a 100644
--- a/sound/pci/emu10k1/emupcm.c
+++ b/sound/pci/emu10k1/emupcm.c
@@ -991,9 +991,7 @@ static void snd_emu10k1_pcm_efx_mixer_notify(emu10k1_t *emu, int idx, int activa
 
 static void snd_emu10k1_pcm_free_substream(snd_pcm_runtime_t *runtime)
 {
-	emu10k1_pcm_t *epcm = runtime->private_data;
-
-	kfree(epcm);
+	kfree(runtime->private_data);
 }
 
 static int snd_emu10k1_efx_playback_close(snd_pcm_substream_t * substream)
diff --git a/sound/pci/via82xx.c b/sound/pci/via82xx.c
index 52d1074..e329e19 100644
--- a/sound/pci/via82xx.c
+++ b/sound/pci/via82xx.c
@@ -491,10 +491,8 @@ static int clean_via_table(viadev_t *dev, snd_pcm_substream_t *substream,
 		snd_dma_free_pages(&dev->table);
 		dev->table.area = NULL;
 	}
-	if (dev->idx_table) {
-		kfree(dev->idx_table);
-		dev->idx_table = NULL;
-	}
+	kfree(dev->idx_table);
+	dev->idx_table = NULL;
 	return 0;
 }
 
diff --git a/sound/pci/via82xx_modem.c b/sound/pci/via82xx_modem.c
index e10fceb..5896d28 100644
--- a/sound/pci/via82xx_modem.c
+++ b/sound/pci/via82xx_modem.c
@@ -352,10 +352,8 @@ static int clean_via_table(viadev_t *dev, snd_pcm_substream_t *substream,
 		snd_dma_free_pages(&dev->table);
 		dev->table.area = NULL;
 	}
-	if (dev->idx_table) {
-		kfree(dev->idx_table);
-		dev->idx_table = NULL;
-	}
+	kfree(dev->idx_table);
+	dev->idx_table = NULL;
 	return 0;
 }
 
diff --git a/sound/pci/ymfpci/ymfpci_main.c b/sound/pci/ymfpci/ymfpci_main.c
index 997cf37..2ae7961 100644
--- a/sound/pci/ymfpci/ymfpci_main.c
+++ b/sound/pci/ymfpci/ymfpci_main.c
@@ -829,9 +829,7 @@ static snd_pcm_hardware_t snd_ymfpci_capture =
 
 static void snd_ymfpci_pcm_free_substream(snd_pcm_runtime_t *runtime)
 {
-	ymfpci_pcm_t *ypcm = runtime->private_data;
-	
-	kfree(ypcm);
+	kfree(runtime->private_data);
 }
 
 static int snd_ymfpci_playback_open_1(snd_pcm_substream_t * substream)