diff --git a/arch/arm/mach-pxa/ssp.c b/arch/arm/mach-pxa/ssp.c
index 422afee88169..b2eb38543d1c 100644
--- a/arch/arm/mach-pxa/ssp.c
+++ b/arch/arm/mach-pxa/ssp.c
@@ -67,7 +67,7 @@ static int use_count[PXA_SSP_PORTS] = {0, 0, 0};
 
 static irqreturn_t ssp_interrupt(int irq, void *dev_id)
 {
-	struct ssp_dev *dev = (struct ssp_dev*) dev_id;
+	struct ssp_dev *dev = dev_id;
 	unsigned int status = SSSR_P(dev->port);
 
 	SSSR_P(dev->port) = status; /* clear status bits */
diff --git a/arch/arm/mach-s3c2410/usb-simtec.c b/arch/arm/mach-s3c2410/usb-simtec.c
index bcd562ac1d3d..6aec86a5da56 100644
--- a/arch/arm/mach-s3c2410/usb-simtec.c
+++ b/arch/arm/mach-s3c2410/usb-simtec.c
@@ -60,7 +60,7 @@ usb_simtec_powercontrol(int port, int to)
 static irqreturn_t
 usb_simtec_ocirq(int irq, void *pw)
 {
-	struct s3c2410_hcd_info *info = (struct s3c2410_hcd_info *)pw;
+	struct s3c2410_hcd_info *info = pw;
 
 	if (s3c2410_gpio_getpin(S3C2410_GPG10) == 0) {
 		pr_debug("usb_simtec: over-current irq (oc detected)\n");
diff --git a/arch/arm/plat-omap/mailbox.c b/arch/arm/plat-omap/mailbox.c
index 0360b1f14d11..45a77df668f1 100644
--- a/arch/arm/plat-omap/mailbox.c
+++ b/arch/arm/plat-omap/mailbox.c
@@ -212,7 +212,7 @@ static void __mbox_rx_interrupt(struct omap_mbox *mbox)
 
 static irqreturn_t mbox_interrupt(int irq, void *p)
 {
-	struct omap_mbox *mbox = (struct omap_mbox *)p;
+	struct omap_mbox *mbox = p;
 
 	if (is_mbox_irq(mbox, IRQ_TX))
 		__mbox_tx_interrupt(mbox);
diff --git a/sound/oss/waveartist.c b/sound/oss/waveartist.c
index b48c72923a13..88490418f932 100644
--- a/sound/oss/waveartist.c
+++ b/sound/oss/waveartist.c
@@ -835,7 +835,7 @@ static struct audio_driver waveartist_audio_driver = {
 static irqreturn_t
 waveartist_intr(int irq, void *dev_id)
 {
-	wavnc_info *devc = (wavnc_info *)dev_id;
+	wavnc_info *devc = dev_id;
 	int	   irqstatus, status;
 
 	spin_lock(&waveartist_lock);