3 files changed, 28 insertions, 8 deletions

diff --git a/drivers/block/aoe/aoechr.c b/drivers/block/aoe/aoechr.c
index e8e60e7a2e7..d1de68a3192 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 ab86e23ddc6..9d92636350e 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 27455ee1e9d..5c74c3574a5 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;
 }