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-rw-r--r--arch/um/drivers/harddog_kern.c3
-rw-r--r--arch/um/drivers/mmapper_kern.c2
-rw-r--r--arch/um/drivers/random.c3
3 files changed, 8 insertions, 0 deletions
diff --git a/arch/um/drivers/harddog_kern.c b/arch/um/drivers/harddog_kern.c
index a9ad4bd..d332503 100644
--- a/arch/um/drivers/harddog_kern.c
+++ b/arch/um/drivers/harddog_kern.c
@@ -66,6 +66,7 @@ static int harddog_open(struct inode *inode, struct file *file)
int err = -EBUSY;
char *sock = NULL;
+ lock_kernel();
spin_lock(&lock);
if(timer_alive)
goto err;
@@ -82,9 +83,11 @@ static int harddog_open(struct inode *inode, struct file *file)
timer_alive = 1;
spin_unlock(&lock);
+ unlock_kernel();
return nonseekable_open(inode, file);
err:
spin_unlock(&lock);
+ unlock_kernel();
return err;
}
diff --git a/arch/um/drivers/mmapper_kern.c b/arch/um/drivers/mmapper_kern.c
index 67b2f55..eb24032 100644
--- a/arch/um/drivers/mmapper_kern.c
+++ b/arch/um/drivers/mmapper_kern.c
@@ -16,6 +16,7 @@
#include <linux/miscdevice.h>
#include <linux/module.h>
#include <linux/mm.h>
+#include <linux/smp_lock.h>
#include <asm/uaccess.h>
#include "mem_user.h"
@@ -77,6 +78,7 @@ out:
static int mmapper_open(struct inode *inode, struct file *file)
{
+ cycle_kernel_lock();
return 0;
}
diff --git a/arch/um/drivers/random.c b/arch/um/drivers/random.c
index 4949044..6eabb70 100644
--- a/arch/um/drivers/random.c
+++ b/arch/um/drivers/random.c
@@ -7,6 +7,7 @@
* of the GNU General Public License, incorporated herein by reference.
*/
#include <linux/sched.h>
+#include <linux/smp_lock.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/interrupt.h>
@@ -33,6 +34,8 @@ static DECLARE_WAIT_QUEUE_HEAD(host_read_wait);
static int rng_dev_open (struct inode *inode, struct file *filp)
{
+ cycle_kernel_lock();
+
/* enforce read-only access to this chrdev */
if ((filp->f_mode & FMODE_READ) == 0)
return -EINVAL;
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