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path: root/drivers/char/rtc.c
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Diffstat (limited to 'drivers/char/rtc.c')
-rw-r--r--drivers/char/rtc.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/char/rtc.c b/drivers/char/rtc.c
index 5f80a9dff57..fa92a8af5a5 100644
--- a/drivers/char/rtc.c
+++ b/drivers/char/rtc.c
@@ -73,6 +73,7 @@
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/spinlock.h>
+#include <linux/smp_lock.h>
#include <linux/sysctl.h>
#include <linux/wait.h>
#include <linux/bcd.h>
@@ -678,12 +679,13 @@ static int rtc_do_ioctl(unsigned int cmd, unsigned long arg, int kernel)
if (arg != (1<<tmp))
return -EINVAL;
+ rtc_freq = arg;
+
spin_lock_irqsave(&rtc_lock, flags);
if (hpet_set_periodic_freq(arg)) {
spin_unlock_irqrestore(&rtc_lock, flags);
return 0;
}
- rtc_freq = arg;
val = CMOS_READ(RTC_FREQ_SELECT) & 0xf0;
val |= (16 - tmp);
@@ -733,6 +735,7 @@ static int rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
* needed here. Or anywhere else in this driver. */
static int rtc_open(struct inode *inode, struct file *file)
{
+ lock_kernel();
spin_lock_irq(&rtc_lock);
if (rtc_status & RTC_IS_OPEN)
@@ -742,10 +745,12 @@ static int rtc_open(struct inode *inode, struct file *file)
rtc_irq_data = 0;
spin_unlock_irq(&rtc_lock);
+ unlock_kernel();
return 0;
out_busy:
spin_unlock_irq(&rtc_lock);
+ unlock_kernel();
return -EBUSY;
}