1 files changed, 14 insertions, 9 deletions

diff --git a/drivers/char/misc.c b/drivers/char/misc.c
index 9fd5a91e0d81..fdb0f9b3fe45 100644
--- a/drivers/char/misc.c
+++ b/drivers/char/misc.c
@@ -117,14 +117,14 @@ static int misc_open(struct inode * inode, struct file * file)
 	const struct file_operations *new_fops = NULL;
 
 	mutex_lock(&misc_mtx);
-	
+
 	list_for_each_entry(c, &misc_list, list) {
 		if (c->minor == minor) {
-			new_fops = fops_get(c->fops);		
+			new_fops = fops_get(c->fops);
 			break;
 		}
 	}
-		
+
 	if (!new_fops) {
 		mutex_unlock(&misc_mtx);
 		request_module("char-major-%d-%d", MISC_MAJOR, minor);
@@ -167,7 +167,7 @@ static const struct file_operations misc_fops = {
 /**
  *	misc_register	-	register a miscellaneous device
  *	@misc: device structure
- *	
+ *
  *	Register a miscellaneous device with the kernel. If the minor
  *	number is set to %MISC_DYNAMIC_MINOR a minor number is assigned
  *	and placed in the minor field of the structure. For other cases
@@ -181,17 +181,18 @@ static const struct file_operations misc_fops = {
  *	A zero is returned on success and a negative errno code for
  *	failure.
  */
- 
+
 int misc_register(struct miscdevice * misc)
 {
 	dev_t dev;
 	int err = 0;
+	bool is_dynamic = (misc->minor == MISC_DYNAMIC_MINOR);
 
 	INIT_LIST_HEAD(&misc->list);
 
 	mutex_lock(&misc_mtx);
 
-	if (misc->minor == MISC_DYNAMIC_MINOR) {
+	if (is_dynamic) {
 		int i = find_first_zero_bit(misc_minors, DYNAMIC_MINORS);
 		if (i >= DYNAMIC_MINORS) {
 			err = -EBUSY;
@@ -216,9 +217,13 @@ int misc_register(struct miscdevice * misc)
 		device_create_with_groups(misc_class, misc->parent, dev,
 					  misc, misc->groups, "%s", misc->name);
 	if (IS_ERR(misc->this_device)) {
-		int i = DYNAMIC_MINORS - misc->minor - 1;
-		if (i < DYNAMIC_MINORS && i >= 0)
-			clear_bit(i, misc_minors);
+		if (is_dynamic) {
+			int i = DYNAMIC_MINORS - misc->minor - 1;
+
+			if (i < DYNAMIC_MINORS && i >= 0)
+				clear_bit(i, misc_minors);
+			misc->minor = MISC_DYNAMIC_MINOR;
+		}
 		err = PTR_ERR(misc->this_device);
 		goto out;
 	}