[PATCH] ds1620: Push BKL down

[Alan Cox <alan@lxorguk.ukuu.org.uk>]

Push down the BKL and correct the ioctl return for unknown ioctls.

Signed-off-by: Alan Cox <alan@redhat.com>

diff --git a/drivers/char/ds1620.c b/drivers/char/ds1620.c
index 334ad5b..6db699d 100644
--- a/drivers/char/ds1620.c
+++ b/drivers/char/ds1620.c
@@ -8,10 +8,11 @@
 #include <linux/proc_fs.h>
 #include <linux/capability.h>
 #include <linux/init.h>
+#include <linux/smp_lock.h>
+#include <linux/uaccess.h>
 
 #include <asm/hardware.h>
 #include <asm/mach-types.h>
-#include <asm/uaccess.h>
 #include <asm/therm.h>
 
 #ifdef CONFIG_PROC_FS
@@ -225,8 +226,8 @@ ds1620_read(struct file *file, char __user *buf, size_t count, loff_t *ptr)
 	return 1;
 }
 
-static int
-ds1620_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
+static long ds1620_ioctl(struct file *file, unsigned int cmd,
+							unsigned long arg)
 {
 	struct therm therm;
 	union {
@@ -254,13 +255,16 @@ ds1620_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned
 
 		therm.lo <<= 1;
 		therm.hi <<= 1;
-
+		lock_kernel();
 		ds1620_write_state(&therm);
+		unlock_kernel();
 		break;
 
 	case CMD_GET_THERMOSTATE:
 	case CMD_GET_THERMOSTATE2:
+		lock_kernel();
 		ds1620_read_state(&therm);
+		unlock_kernel();
 
 		therm.lo >>= 1;
 		therm.hi >>= 1;
@@ -276,20 +280,25 @@ ds1620_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned
 
 	case CMD_GET_TEMPERATURE:
 	case CMD_GET_TEMPERATURE2:
+		lock_kernel();
 		i = cvt_9_to_int(ds1620_in(THERM_READ_TEMP, 9));
 
 		if (cmd == CMD_GET_TEMPERATURE)
 			i >>= 1;
-
+		unlock_kernel();
 		return put_user(i, uarg.i) ? -EFAULT : 0;
 
 	case CMD_GET_STATUS:
+		lock_kernel();
 		i = ds1620_in(THERM_READ_CONFIG, 8) & 0xe3;
+		unlock_kernel();
 
 		return put_user(i, uarg.i) ? -EFAULT : 0;
 
 	case CMD_GET_FAN:
+		lock_kernel();
 		i = netwinder_get_fan();
+		unnlock_kernel();
 
 		return put_user(i, uarg.i) ? -EFAULT : 0;
 
@@ -299,14 +308,14 @@ ds1620_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned
 
 		if (get_user(i, uarg.i))
 			return -EFAULT;
-
+		lock_kernel();
 		netwinder_set_fan(i);
+		unlock_kernel();
 		break;
 		
 	default:
-		return -ENOIOCTLCMD;
+		return -ENOTTY;
 	}
-
 	return 0;
 }
 
@@ -338,7 +347,7 @@ static const struct file_operations ds1620_fops = {
 	.owner		= THIS_MODULE,
 	.open		= nonseekable_open,
 	.read		= ds1620_read,
-	.ioctl		= ds1620_ioctl,
+	.unlocked_ioctl	= ds1620_ioctl,
 };
 
 static struct miscdevice ds1620_miscdev = {