summaryrefslogtreecommitdiff
path: root/drivers/watchdog/cpwd.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/watchdog/cpwd.c')
-rw-r--r--drivers/watchdog/cpwd.c16
1 files changed, 9 insertions, 7 deletions
diff --git a/drivers/watchdog/cpwd.c b/drivers/watchdog/cpwd.c
index 566343b3c131..eca855a55c0d 100644
--- a/drivers/watchdog/cpwd.c
+++ b/drivers/watchdog/cpwd.c
@@ -25,7 +25,7 @@
#include <linux/ioport.h>
#include <linux/timer.h>
#include <linux/slab.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_device.h>
@@ -89,6 +89,7 @@ struct cpwd {
} devs[WD_NUMDEVS];
};
+static DEFINE_MUTEX(cpwd_mutex);
static struct cpwd *cpwd_device;
/* Sun uses Altera PLD EPF8820ATC144-4
@@ -368,7 +369,7 @@ static int cpwd_open(struct inode *inode, struct file *f)
{
struct cpwd *p = cpwd_device;
- lock_kernel();
+ mutex_lock(&cpwd_mutex);
switch (iminor(inode)) {
case WD0_MINOR:
case WD1_MINOR:
@@ -376,7 +377,7 @@ static int cpwd_open(struct inode *inode, struct file *f)
break;
default:
- unlock_kernel();
+ mutex_unlock(&cpwd_mutex);
return -ENODEV;
}
@@ -386,13 +387,13 @@ static int cpwd_open(struct inode *inode, struct file *f)
IRQF_SHARED, DRIVER_NAME, p)) {
printk(KERN_ERR PFX "Cannot register IRQ %d\n",
p->irq);
- unlock_kernel();
+ mutex_unlock(&cpwd_mutex);
return -EBUSY;
}
p->initialized = true;
}
- unlock_kernel();
+ mutex_unlock(&cpwd_mutex);
return nonseekable_open(inode, f);
}
@@ -482,9 +483,9 @@ static long cpwd_compat_ioctl(struct file *file, unsigned int cmd,
case WIOCSTART:
case WIOCSTOP:
case WIOCGSTAT:
- lock_kernel();
+ mutex_lock(&cpwd_mutex);
rval = cpwd_ioctl(file, cmd, arg);
- unlock_kernel();
+ mutex_unlock(&cpwd_mutex);
break;
/* everything else is handled by the generic compat layer */
@@ -524,6 +525,7 @@ static const struct file_operations cpwd_fops = {
.write = cpwd_write,
.read = cpwd_read,
.release = cpwd_release,
+ .llseek = no_llseek,
};
static int __devinit cpwd_probe(struct platform_device *op,