5 files changed, 31 insertions, 13 deletions
diff --git a/drivers/isdn/capi/capi.c b/drivers/isdn/capi/capi.c
index 6ca0bb949ad..2095153582f 100644
--- a/drivers/isdn/capi/capi.c
+++ b/drivers/isdn/capi/capi.c
@@ -20,6 +20,7 @@
 #include <linux/signal.h>
 #include <linux/mutex.h>
 #include <linux/mm.h>
+#include <linux/smp_lock.h>
 #include <linux/timer.h>
 #include <linux/wait.h>
 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
@@ -983,13 +984,17 @@ capi_ioctl(struct inode *inode, struct file *file,
 static int
 capi_open(struct inode *inode, struct file *file)
 {
+	int ret;
+	
+	lock_kernel();
 	if (file->private_data)
-		return -EEXIST;
-
-	if ((file->private_data = capidev_alloc()) == NULL)
-		return -ENOMEM;
-
-	return nonseekable_open(inode, file);
+		ret = -EEXIST;
+	else if ((file->private_data = capidev_alloc()) == NULL)
+		ret = -ENOMEM;
+	else
+		ret = nonseekable_open(inode, file);
+	unlock_kernel();
+	return ret;
 }
 
 static int
diff --git a/drivers/isdn/hardware/eicon/divamnt.c b/drivers/isdn/hardware/eicon/divamnt.c
index c9092897424..1e85f743214 100644
--- a/drivers/isdn/hardware/eicon/divamnt.c
+++ b/drivers/isdn/hardware/eicon/divamnt.c
@@ -14,6 +14,7 @@
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/poll.h>
+#include <linux/smp_lock.h>
 #include <asm/uaccess.h>
 
 #include "platform.h"
@@ -127,14 +128,19 @@ static unsigned int maint_poll(struct file *file, poll_table * wait)
 
 static int maint_open(struct inode *ino, struct file *filep)
 {
+	int ret;
+
+	lock_kernel();
 	/* only one open is allowed, so we test
 	   it atomically */
 	if (test_and_set_bit(0, &opened))
-		return (-EBUSY);
-
-	filep->private_data = NULL;
-
-	return nonseekable_open(ino, filep);
+		ret = -EBUSY;
+	else {
+		filep->private_data = NULL;
+		ret = nonseekable_open(ino, filep);
+	}
+	unlock_kernel();
+	return ret;
 }
 
 static int maint_close(struct inode *ino, struct file *filep)
diff --git a/drivers/isdn/hardware/eicon/divasi.c b/drivers/isdn/hardware/eicon/divasi.c
index 78f141e7746..f4969fe0a05 100644
--- a/drivers/isdn/hardware/eicon/divasi.c
+++ b/drivers/isdn/hardware/eicon/divasi.c
@@ -17,6 +17,7 @@
 #include <linux/poll.h>
 #include <linux/proc_fs.h>
 #include <linux/skbuff.h>
+#include <linux/smp_lock.h>
 #include <asm/uaccess.h>
 
 #include "platform.h"
@@ -400,6 +401,7 @@ static unsigned int um_idi_poll(struct file *file, poll_table * wait)
 
 static int um_idi_open(struct inode *inode, struct file *file)
 {
+	cycle_kernel_lock();
 	return (0);
 }
 
diff --git a/drivers/isdn/hardware/eicon/divasmain.c b/drivers/isdn/hardware/eicon/divasmain.c
index 16a874bb156..fbbcb27fb68 100644
--- a/drivers/isdn/hardware/eicon/divasmain.c
+++ b/drivers/isdn/hardware/eicon/divasmain.c
@@ -21,6 +21,7 @@
 #include <linux/list.h>
 #include <linux/poll.h>
 #include <linux/kmod.h>
+#include <linux/smp_lock.h>
 
 #include "platform.h"
 #undef ID_MASK
@@ -580,6 +581,7 @@ xdi_copy_from_user(void *os_handle, void *dst, const void __user *src, int lengt
  */
 static int divas_open(struct inode *inode, struct file *file)
 {
+	cycle_kernel_lock();
 	return (0);
 }
 
diff --git a/drivers/isdn/i4l/isdn_common.c b/drivers/isdn/i4l/isdn_common.c
index 0f3c66de69b..7188c59a76f 100644
--- a/drivers/isdn/i4l/isdn_common.c
+++ b/drivers/isdn/i4l/isdn_common.c
@@ -1732,7 +1732,7 @@ isdn_open(struct inode *ino, struct file *filep)
 	int chidx;
 	int retval = -ENODEV;
 
-
+	lock_kernel();
 	if (minor == ISDN_MINOR_STATUS) {
 		infostruct *p;
 
@@ -1783,6 +1783,7 @@ isdn_open(struct inode *ino, struct file *filep)
 #endif
  out:
 	nonseekable_open(ino, filep);
+	unlock_kernel();
 	return retval;
 }
 
@@ -1977,8 +1978,10 @@ isdn_writebuf_stub(int drvidx, int chan, const u_char __user * buf, int len)
 	if (!skb)
 		return -ENOMEM;
 	skb_reserve(skb, hl);
-	if (copy_from_user(skb_put(skb, len), buf, len))
+	if (copy_from_user(skb_put(skb, len), buf, len)) {
+		dev_kfree_skb(skb);
 		return -EFAULT;
+	}
 	ret = dev->drv[drvidx]->interface->writebuf_skb(drvidx, chan, 1, skb);
 	if (ret <= 0)
 		dev_kfree_skb(skb);