3 files changed, 28 insertions, 8 deletions

diff --git a/drivers/block/aoe/aoechr.c b/drivers/block/aoe/aoechr.c
index e8e60e7a2e70..d1de68a31920 100644
--- a/drivers/block/aoe/aoechr.c
+++ b/drivers/block/aoe/aoechr.c
@@ -7,6 +7,7 @@
 #include <linux/hdreg.h>
 #include <linux/blkdev.h>
 #include <linux/delay.h>
+#include <linux/smp_lock.h>
 #include "aoe.h"
 
 enum {
@@ -174,12 +175,16 @@ aoechr_open(struct inode *inode, struct file *filp)
 {
 	int n, i;
 
+	lock_kernel();
 	n = iminor(inode);
 	filp->private_data = (void *) (unsigned long) n;
 
 	for (i = 0; i < ARRAY_SIZE(chardevs); ++i)
-		if (chardevs[i].minor == n)
+		if (chardevs[i].minor == n) {
+			unlock_kernel();
 			return 0;
+		}
+	unlock_kernel();
 	return -EINVAL;
 }
 
diff --git a/drivers/block/paride/pg.c b/drivers/block/paride/pg.c
index ab86e23ddc69..9d92636350e5 100644
--- a/drivers/block/paride/pg.c
+++ b/drivers/block/paride/pg.c
@@ -162,6 +162,7 @@ enum {D_PRT, D_PRO, D_UNI, D_MOD, D_SLV, D_DLY};
 #include <linux/pg.h>
 #include <linux/device.h>
 #include <linux/sched.h>	/* current, TASK_* */
+#include <linux/smp_lock.h>
 #include <linux/jiffies.h>
 
 #include <asm/uaccess.h>
@@ -515,12 +516,18 @@ static int pg_open(struct inode *inode, struct file *file)
 {
 	int unit = iminor(inode) & 0x7f;
 	struct pg *dev = &devices[unit];
+	int ret = 0;
 
-	if ((unit >= PG_UNITS) || (!dev->present))
-		return -ENODEV;
+	lock_kernel();
+	if ((unit >= PG_UNITS) || (!dev->present)) {
+		ret = -ENODEV;
+		goto out;
+	}
 
-	if (test_and_set_bit(0, &dev->access))
-		return -EBUSY;
+	if (test_and_set_bit(0, &dev->access)) {
+		ret = -EBUSY;
+		goto out;
+	}
 
 	if (dev->busy) {
 		pg_reset(dev);
@@ -533,12 +540,15 @@ static int pg_open(struct inode *inode, struct file *file)
 	if (dev->bufptr == NULL) {
 		clear_bit(0, &dev->access);
 		printk("%s: buffer allocation failed\n", dev->name);
-		return -ENOMEM;
+		ret = -ENOMEM;
+		goto out;
 	}
 
 	file->private_data = dev;
 
-	return 0;
+out:
+	unlock_kernel();
+	return ret;
 }
 
 static int pg_release(struct inode *inode, struct file *file)
diff --git a/drivers/block/paride/pt.c b/drivers/block/paride/pt.c
index 27455ee1e9da..5c74c3574a5a 100644
--- a/drivers/block/paride/pt.c
+++ b/drivers/block/paride/pt.c
@@ -650,8 +650,11 @@ static int pt_open(struct inode *inode, struct file *file)
 	struct pt_unit *tape = pt + unit;
 	int err;
 
-	if (unit >= PT_UNITS || (!tape->present))
+	lock_kernel();
+	if (unit >= PT_UNITS || (!tape->present)) {
+		unlock_kernel();
 		return -ENODEV;
+	}
 
 	err = -EBUSY;
 	if (!atomic_dec_and_test(&tape->available))
@@ -678,10 +681,12 @@ static int pt_open(struct inode *inode, struct file *file)
 	}
 
 	file->private_data = tape;
+	unlock_kernel();
 	return 0;
 
 out:
 	atomic_inc(&tape->available);
+	unlock_kernel();
 	return err;
 }