[PATCH] I2C: Convert i2c to mutexes

The patch below converts a few i2c semaphores to mutexes

Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2 files changed, 12 insertions, 10 deletions

diff --git a/drivers/i2c/chips/ds1374.c b/drivers/i2c/chips/ds1374.c
index 0710b9da9d54..03d09ed5ec2c 100644
--- a/drivers/i2c/chips/ds1374.c
+++ b/drivers/i2c/chips/ds1374.c
@@ -26,6 +26,7 @@
 #include <linux/i2c.h>
 #include <linux/rtc.h>
 #include <linux/bcd.h>
+#include <linux/mutex.h>
 
 #define DS1374_REG_TOD0         0x00
 #define DS1374_REG_TOD1         0x01
@@ -41,7 +42,7 @@
 
 #define DS1374_DRV_NAME         "ds1374"
 
-static DECLARE_MUTEX(ds1374_mutex);
+static DEFINE_MUTEX(ds1374_mutex);
 
 static struct i2c_driver ds1374_driver;
 static struct i2c_client *save_client;
@@ -114,7 +115,7 @@ ulong ds1374_get_rtc_time(void)
         ulong t1, t2;
         int limit = 10;         /* arbitrary retry limit */
 
-        down(&ds1374_mutex);
+        mutex_lock(&ds1374_mutex);
 
         /*
          * Since the reads are being performed one byte at a time using
@@ -127,7 +128,7 @@ ulong ds1374_get_rtc_time(void)
                 t2 = ds1374_read_rtc();
         } while (t1 != t2 && limit--);
 
-        up(&ds1374_mutex);
+        mutex_unlock(&ds1374_mutex);
 
         if (t1 != t2) {
                 dev_warn(&save_client->dev,
@@ -145,7 +146,7 @@ static void ds1374_set_tlet(ulong arg)
 
         t1 = *(ulong *) arg;
 
-        down(&ds1374_mutex);
+        mutex_lock(&ds1374_mutex);
 
         /*
          * Since the writes are being performed one byte at a time using
@@ -158,7 +159,7 @@ static void ds1374_set_tlet(ulong arg)
                 t2 = ds1374_read_rtc();
         } while (t1 != t2 && limit--);
 
-        up(&ds1374_mutex);
+        mutex_unlock(&ds1374_mutex);
 
         if (t1 != t2)
                 dev_warn(&save_client->dev,
diff --git a/drivers/i2c/chips/m41t00.c b/drivers/i2c/chips/m41t00.c
index 2dc3d48375fc..b5aabe7cf792 100644
--- a/drivers/i2c/chips/m41t00.c
+++ b/drivers/i2c/chips/m41t00.c
@@ -24,13 +24,14 @@
 #include <linux/i2c.h>
 #include <linux/rtc.h>
 #include <linux/bcd.h>
+#include <linux/mutex.h>
 
 #include <asm/time.h>
 #include <asm/rtc.h>
 
 #define M41T00_DRV_NAME         "m41t00"
 
-static DECLARE_MUTEX(m41t00_mutex);
+static DEFINE_MUTEX(m41t00_mutex);
 
 static struct i2c_driver m41t00_driver;
 static struct i2c_client *save_client;
@@ -54,7 +55,7 @@ m41t00_get_rtc_time(void)
         sec = min = hour = day = mon = year = 0;
         sec1 = min1 = hour1 = day1 = mon1 = year1 = 0;
 
-        down(&m41t00_mutex);
+        mutex_lock(&m41t00_mutex);
         do {
                 if (((sec = i2c_smbus_read_byte_data(save_client, 0)) >= 0)
                         && ((min = i2c_smbus_read_byte_data(save_client, 1))
@@ -80,7 +81,7 @@ m41t00_get_rtc_time(void)
                 mon1 = mon;
                 year1 = year;
         } while (--limit > 0);
-        up(&m41t00_mutex);
+        mutex_unlock(&m41t00_mutex);
 
         if (limit == 0) {
                 dev_warn(&save_client->dev,
@@ -125,7 +126,7 @@ m41t00_set_tlet(ulong arg)
         BIN_TO_BCD(tm.tm_mday);
         BIN_TO_BCD(tm.tm_year);
 
-        down(&m41t00_mutex);
+        mutex_lock(&m41t00_mutex);
         if ((i2c_smbus_write_byte_data(save_client, 0, tm.tm_sec & 0x7f) < 0)
                 || (i2c_smbus_write_byte_data(save_client, 1, tm.tm_min & 0x7f)
                         < 0)
@@ -140,7 +141,7 @@ m41t00_set_tlet(ulong arg)
 
                 dev_warn(&save_client->dev,"m41t00: can't write to rtc chip\n");
 
-        up(&m41t00_mutex);
+        mutex_unlock(&m41t00_mutex);
         return;
 }