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path: root/drivers/char/nvram.c
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Diffstat (limited to 'drivers/char/nvram.c')
-rw-r--r--drivers/char/nvram.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/char/nvram.c b/drivers/char/nvram.c
index 66d2917..166f1e7 100644
--- a/drivers/char/nvram.c
+++ b/drivers/char/nvram.c
@@ -109,10 +109,11 @@
#include <linux/spinlock.h>
#include <linux/io.h>
#include <linux/uaccess.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
#include <asm/system.h>
+static DEFINE_MUTEX(nvram_mutex);
static DEFINE_SPINLOCK(nvram_state_lock);
static int nvram_open_cnt; /* #times opened */
static int nvram_open_mode; /* special open modes */
@@ -308,7 +309,7 @@ static long nvram_ioctl(struct file *file, unsigned int cmd,
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
- lock_kernel();
+ mutex_lock(&nvram_mutex);
spin_lock_irq(&rtc_lock);
for (i = 0; i < NVRAM_BYTES; ++i)
@@ -316,7 +317,7 @@ static long nvram_ioctl(struct file *file, unsigned int cmd,
__nvram_set_checksum();
spin_unlock_irq(&rtc_lock);
- unlock_kernel();
+ mutex_unlock(&nvram_mutex);
return 0;
case NVRAM_SETCKS:
@@ -325,11 +326,11 @@ static long nvram_ioctl(struct file *file, unsigned int cmd,
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
- lock_kernel();
+ mutex_lock(&nvram_mutex);
spin_lock_irq(&rtc_lock);
__nvram_set_checksum();
spin_unlock_irq(&rtc_lock);
- unlock_kernel();
+ mutex_unlock(&nvram_mutex);
return 0;
default:
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