s3c2443-ac97: convert semaphore to mutex

This fixes a build failure for 2.6.31-rc4-rt1 (ARCH=arm, s3c2410_defconfig):

  sound/soc/s3c24xx/s3c2443-ac97.c:50: warning: type defaults to 'int' in declaration of 'DECLARE_MUTEX'
  sound/soc/s3c24xx/s3c2443-ac97.c:50: warning: parameter names (without types) in function declaration
  sound/soc/s3c24xx/s3c2443-ac97.c: In function 's3c2443_ac97_read':
  sound/soc/s3c24xx/s3c2443-ac97.c:59: error: 'ac97_mutex' undeclared (first use in this function)
  sound/soc/s3c24xx/s3c2443-ac97.c:59: error: (Each undeclared identifier is reported only once
  sound/soc/s3c24xx/s3c2443-ac97.c:59: error: for each function it appears in.)
  sound/soc/s3c24xx/s3c2443-ac97.c: In function 's3c2443_ac97_write':
  sound/soc/s3c24xx/s3c2443-ac97.c:93: error: 'ac97_mutex' undeclared (first use in this function)
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Cc: Takashi Iwai <tiwai@suse.de>
Cc: Jaroslav Kysela <perex@perex.cz>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: Liam Girdwood <lrg@slimlogic.co.uk>
Cc: Ben Dooks <ben-linux@fluff.org>
Cc: Timur Tabi <timur@freescale.com>
Cc: Eric Miao <eric.miao@marvell.com>
Cc: alsa-devel@alsa-project.org
LKML-Reference: <1249677761-19470-2-git-send-email-u.kleine-koenig@pengutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

sound/soc/s3c24xx/s3c2443-ac97.c

@@ -47,7 +47,7 @@ static struct s3c24xx_ac97_info s3c24xx_ac97;
 
 static DECLARE_COMPLETION(ac97_completion);
 static u32 codec_ready;
-static DECLARE_MUTEX(ac97_mutex);
+static DEFINE_MUTEX(ac97_mutex);
 
 static unsigned short s3c2443_ac97_read(struct snd_ac97 *ac97,
 	unsigned short reg)
@@ -56,7 +56,7 @@ static unsigned short s3c2443_ac97_read(struct snd_ac97 *ac97,
 	u32 ac_codec_cmd;
 	u32 stat, addr, data;
 
-	down(&ac97_mutex);
+	mutex_lock(&ac97_mutex);
 
 	codec_ready = S3C_AC97_GLBSTAT_CODECREADY;
 	ac_codec_cmd = readl(s3c24xx_ac97.regs + S3C_AC97_CODEC_CMD);
@@ -79,7 +79,7 @@ static unsigned short s3c2443_ac97_read(struct snd_ac97 *ac97,
 		printk(KERN_ERR "s3c24xx-ac97: req addr = %02x,"
 				" rep addr = %02x\n", reg, addr);
 
-	up(&ac97_mutex);
+	mutex_unlock(&ac97_mutex);
 
 	return (unsigned short)data;
 }
@@ -90,7 +90,7 @@ static void s3c2443_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
 	u32 ac_glbctrl;
 	u32 ac_codec_cmd;
 
-	down(&ac97_mutex);
+	mutex_lock(&ac97_mutex);
 
 	codec_ready = S3C_AC97_GLBSTAT_CODECREADY;
 	ac_codec_cmd = readl(s3c24xx_ac97.regs + S3C_AC97_CODEC_CMD);
@@ -109,7 +109,7 @@ static void s3c2443_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
 	ac_codec_cmd |= S3C_AC97_CODEC_CMD_READ;
 	writel(ac_codec_cmd, s3c24xx_ac97.regs + S3C_AC97_CODEC_CMD);
 
-	up(&ac97_mutex);
+	mutex_unlock(&ac97_mutex);
 
 }