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path: root/drivers/char/ds1302.c
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Diffstat (limited to 'drivers/char/ds1302.c')
-rw-r--r--drivers/char/ds1302.c16
1 files changed, 9 insertions, 7 deletions
diff --git a/drivers/char/ds1302.c b/drivers/char/ds1302.c
index 170693c93c73..ed8303f9890c 100644
--- a/drivers/char/ds1302.c
+++ b/drivers/char/ds1302.c
@@ -20,7 +20,7 @@
#include <linux/miscdevice.h>
#include <linux/delay.h>
#include <linux/bcd.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
#include <linux/uaccess.h>
#include <linux/io.h>
@@ -32,6 +32,7 @@
#define RTC_MAJOR_NR 121 /* local major, change later */
+static DEFINE_MUTEX(rtc_mutex);
static const char ds1302_name[] = "ds1302";
/* Send 8 bits. */
@@ -164,9 +165,9 @@ static long rtc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
struct rtc_time rtc_tm;
memset(&rtc_tm, 0, sizeof (struct rtc_time));
- lock_kernel();
+ mutex_lock(&rtc_mutex);
get_rtc_time(&rtc_tm);
- unlock_kernel();
+ mutex_unlock(&rtc_mutex);
if (copy_to_user((struct rtc_time*)arg, &rtc_tm, sizeof(struct rtc_time)))
return -EFAULT;
return 0;
@@ -218,7 +219,7 @@ static long rtc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
mon = bin2bcd(mon);
yrs = bin2bcd(yrs);
- lock_kernel();
+ mutex_lock(&rtc_mutex);
local_irq_save(flags);
CMOS_WRITE(yrs, RTC_YEAR);
CMOS_WRITE(mon, RTC_MONTH);
@@ -227,7 +228,7 @@ static long rtc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
CMOS_WRITE(min, RTC_MINUTES);
CMOS_WRITE(sec, RTC_SECONDS);
local_irq_restore(flags);
- unlock_kernel();
+ mutex_unlock(&rtc_mutex);
/* Notice that at this point, the RTC is updated but
* the kernel is still running with the old time.
@@ -247,10 +248,10 @@ static long rtc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
if(copy_from_user(&tcs_val, (int*)arg, sizeof(int)))
return -EFAULT;
- lock_kernel();
+ mutex_lock(&rtc_mutex);
tcs_val = RTC_TCR_PATTERN | (tcs_val & 0x0F);
ds1302_writereg(RTC_TRICKLECHARGER, tcs_val);
- unlock_kernel();
+ mutex_unlock(&rtc_mutex);
return 0;
}
default:
@@ -288,6 +289,7 @@ get_rtc_status(char *buf)
static const struct file_operations rtc_fops = {
.owner = THIS_MODULE,
.unlocked_ioctl = rtc_ioctl,
+ .llseek = noop_llseek,
};
/* Probe for the chip by writing something to its RAM and try reading it back. */