cris: autoconvert trivial BKL users

All uses of the big kernel lock in the cris architecture
are for ioctl and open functions of character device drivers,
which can be trivially converted to a per-driver mutex.

Most of these are probably unnecessary, so it may make sense
to audit them and eventually remove the extra mutex introduced
by this patch.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Mikael Starvik <starvik@axis.com>
Cc: Jesper Nilsson <jesper.nilsson@axis.com>
Cc: linux-cris-kernel@axis.com

1 files changed, 3 insertions, 3 deletions

diff --git a/arch/cris/arch-v32/drivers/pcf8563.c b/arch/cris/arch-v32/drivers/pcf8563.c
index bef6eb53b153..bdcac9dec5cb 100644
--- a/arch/cris/arch-v32/drivers/pcf8563.c
+++ b/arch/cris/arch-v32/drivers/pcf8563.c
@@ -24,7 +24,6 @@
 #include <linux/init.h>
 #include <linux/fs.h>
 #include <linux/ioctl.h>
-#include <linux/smp_lock.h>
 #include <linux/delay.h>
 #include <linux/bcd.h>
 #include <linux/mutex.h>
@@ -45,6 +44,7 @@
 #define rtc_read(x) i2c_readreg(RTC_I2C_READ, x)
 #define rtc_write(x,y) i2c_writereg(RTC_I2C_WRITE, x, y)
 
+static DEFINE_MUTEX(pcf8563_mutex);
 static DEFINE_MUTEX(rtc_lock); /* Protect state etc */
 
 static const unsigned char days_in_month[] =
@@ -339,9 +339,9 @@ static long pcf8563_unlocked_ioctl(struct file *filp, unsigned int cmd, unsigned
 {
         int ret;
 
-        lock_kernel();
+        mutex_lock(&pcf8563_mutex);
         return pcf8563_ioctl(filp, cmd, arg);
-        unlock_kernel();
+        mutex_unlock(&pcf8563_mutex);
 
         return ret;
 }