diff -r 5cac1af69dd1 -r 0992f932f68a driver/pt1_pci.c
--- a/driver/pt1_pci.c	Tue Nov 08 22:47:17 2011 +0900
+++ b/driver/pt1_pci.c	Fri Nov 11 22:56:07 2011 +0900
@@ -19,8 +19,10 @@
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23)
 #include <linux/freezer.h>
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36)
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,39)
 #include <linux/smp_lock.h>
 #endif
+#endif
 #else
 #define set_freezable()
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,11)
@@ -148,6 +150,10 @@
 #define		PT1MAJOR	251
 #define		DRIVERNAME	"pt1video"
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,39)
+static DEFINE_MUTEX(pt1_ioctl_mutex);
+#endif
+
 static	void	reset_dma(PT1_DEVICE *dev_conf)
 {
 
@@ -537,6 +543,7 @@
 			return 0 ;
 		case STOP_REC:
 			SetStream(channel->ptr->regs, channel->channel, FALSE);
+			schedule_timeout_interruptible(msecs_to_jiffies(100));
 			return 0 ;
 		case GET_SIGNAL_STRENGTH:
 			switch(channel->type){
@@ -577,9 +584,18 @@
 {
 	long rc;
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,39)
+	if(mutex_lock_interruptible(&pt1_ioctl_mutex))
+		return -EINTR;
+#else
 	lock_kernel();
+#endif
 	rc = pt1_ioctl(file->f_path.dentry->d_inode, file, cmd, arg);
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,39)
+	mutex_unlock(&pt1_ioctl_mutex);
+#else
 	unlock_kernel();
+#endif
 	return rc;
 }
 #endif