tlclk: remove big kernel lock

This driver already has a global mutex, so let's just
use that in the open function instead of the BKL.
It may not even be needed there, but this patch should
have the smallest impact.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Mark Gross <mark.gross@intel.com>

diff --git a/drivers/char/tlclk.c b/drivers/char/tlclk.c
index 80ea6bcfffdc4136c07a79483d4ad65d11556302..e32cbf0c9a0b92a22c4053bab922b5e1ea5b615c 100644 (file)
--- a/drivers/char/tlclk.c
+++ b/drivers/char/tlclk.c
@@ -37,7 +37,7 @@
 #include <linux/ioport.h>
 #include <linux/interrupt.h>
 #include <linux/spinlock.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/timer.h>
 #include <linux/sysfs.h>
 #include <linux/device.h>
@@ -206,7 +206,7 @@ static int tlclk_open(struct inode *inode, struct file *filp)
 {
        int result;
 
-       lock_kernel();
+       mutex_lock(&tlclk_mutex);
        if (test_and_set_bit(0, &useflags)) {
                result = -EBUSY;
                /* this legacy device is always one per system and it doesn't
@@ -229,7 +229,7 @@ static int tlclk_open(struct inode *inode, struct file *filp)
                inb(TLCLK_REG6);        /* Clear interrupt events */
 
 out:
-       unlock_kernel();
+       mutex_unlock(&tlclk_mutex);
        return result;
 }