1 files changed, 262 insertions, 160 deletions

diff --git a/drivers/input/input.c b/drivers/input/input.c
index f8af0945964e..a935abeffffc 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -18,9 +18,11 @@
 #include <linux/random.h>
 #include <linux/major.h>
 #include <linux/proc_fs.h>
+#include <linux/seq_file.h>
 #include <linux/interrupt.h>
 #include <linux/poll.h>
 #include <linux/device.h>
+#include <linux/mutex.h>
 
 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
 MODULE_DESCRIPTION("Input core");
@@ -224,7 +226,7 @@ int input_open_device(struct input_handle *handle)
 	struct input_dev *dev = handle->dev;
 	int err;
 
-	err = down_interruptible(&dev->sem);
+	err = mutex_lock_interruptible(&dev->mutex);
 	if (err)
 		return err;
 
@@ -236,7 +238,7 @@ int input_open_device(struct input_handle *handle)
 	if (err)
 		handle->open--;
 
-	up(&dev->sem);
+	mutex_unlock(&dev->mutex);
 
 	return err;
 }
@@ -255,13 +257,13 @@ void input_close_device(struct input_handle *handle)
 
 	input_release_device(handle);
 
-	down(&dev->sem);
+	mutex_lock(&dev->mutex);
 
 	if (!--dev->users && dev->close)
 		dev->close(dev);
 	handle->open--;
 
-	up(&dev->sem);
+	mutex_unlock(&dev->mutex);
 }
 
 static void input_link_handle(struct input_handle *handle)
@@ -315,21 +317,6 @@ static struct input_device_id *input_match_device(struct input_device_id *id, st
 	return NULL;
 }
 
-static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, int max)
-{
-	int i;
-	int len = 0;
-
-	for (i = NBITS(max) - 1; i > 0; i--)
-		if (bitmap[i])
-			break;
-
-	for (; i >= 0; i--)
-		len += snprintf(buf + len, max(buf_size - len, 0),
-				"%lx%s", bitmap[i], i > 0 ? " " : "");
-	return len;
-}
-
 #ifdef CONFIG_PROC_FS
 
 static struct proc_dir_entry *proc_bus_input_dir;
@@ -342,7 +329,7 @@ static inline void input_wakeup_procfs_readers(void)
 	wake_up(&input_devices_poll_wait);
 }
 
-static unsigned int input_devices_poll(struct file *file, poll_table *wait)
+static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
 {
 	int state = input_devices_state;
 	poll_wait(file, &input_devices_poll_wait, wait);
@@ -351,115 +338,171 @@ static unsigned int input_devices_poll(struct file *file, poll_table *wait)
 	return 0;
 }
 
-#define SPRINTF_BIT(ev, bm)						\
-	do {								\
-		len += sprintf(buf + len, "B: %s=", #ev);		\
-		len += input_print_bitmap(buf + len, INT_MAX,		\
-					dev->bm##bit, ev##_MAX);	\
-		len += sprintf(buf + len, "\n");			\
-	} while (0)
+static struct list_head *list_get_nth_element(struct list_head *list, loff_t *pos)
+{
+	struct list_head *node;
+	loff_t i = 0;
 
-#define TEST_AND_SPRINTF_BIT(ev, bm)					\
-	do {								\
-		if (test_bit(EV_##ev, dev->evbit))			\
-			SPRINTF_BIT(ev, bm);				\
-	} while (0)
+	list_for_each(node, list)
+		if (i++ == *pos)
+			return node;
+
+	return NULL;
+}
 
-static int input_devices_read(char *buf, char **start, off_t pos, int count, int *eof, void *data)
+static struct list_head *list_get_next_element(struct list_head *list, struct list_head *element, loff_t *pos)
 {
-	struct input_dev *dev;
-	struct input_handle *handle;
-	const char *path;
+	if (element->next == list)
+		return NULL;
+
+	++(*pos);
+	return element->next;
+}
+
+static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
+{
+	/* acquire lock here ... Yes, we do need locking, I knowi, I know... */
+
+	return list_get_nth_element(&input_dev_list, pos);
+}
 
-	off_t at = 0;
-	int len, cnt = 0;
+static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	return list_get_next_element(&input_dev_list, v, pos);
+}
 
-	list_for_each_entry(dev, &input_dev_list, node) {
+static void input_devices_seq_stop(struct seq_file *seq, void *v)
+{
+	/* release lock here */
+}
 
-		path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
+static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
+				   unsigned long *bitmap, int max)
+{
+	int i;
 
-		len = sprintf(buf, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
-			dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
+	for (i = NBITS(max) - 1; i > 0; i--)
+		if (bitmap[i])
+			break;
 
-		len += sprintf(buf + len, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
-		len += sprintf(buf + len, "P: Phys=%s\n", dev->phys ? dev->phys : "");
-		len += sprintf(buf + len, "S: Sysfs=%s\n", path ? path : "");
-		len += sprintf(buf + len, "H: Handlers=");
+	seq_printf(seq, "B: %s=", name);
+	for (; i >= 0; i--)
+		seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : "");
+	seq_putc(seq, '\n');
+}
 
-		list_for_each_entry(handle, &dev->h_list, d_node)
-			len += sprintf(buf + len, "%s ", handle->name);
-
-		len += sprintf(buf + len, "\n");
-
-		SPRINTF_BIT(EV, ev);
-		TEST_AND_SPRINTF_BIT(KEY, key);
-		TEST_AND_SPRINTF_BIT(REL, rel);
-		TEST_AND_SPRINTF_BIT(ABS, abs);
-		TEST_AND_SPRINTF_BIT(MSC, msc);
-		TEST_AND_SPRINTF_BIT(LED, led);
-		TEST_AND_SPRINTF_BIT(SND, snd);
-		TEST_AND_SPRINTF_BIT(FF, ff);
-		TEST_AND_SPRINTF_BIT(SW, sw);
-
-		len += sprintf(buf + len, "\n");
-
-		at += len;
-
-		if (at >= pos) {
-			if (!*start) {
-				*start = buf + (pos - (at - len));
-				cnt = at - pos;
-			} else  cnt += len;
-			buf += len;
-			if (cnt >= count)
-				break;
-		}
+static int input_devices_seq_show(struct seq_file *seq, void *v)
+{
+	struct input_dev *dev = container_of(v, struct input_dev, node);
+	const char *path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
+	struct input_handle *handle;
 
-		kfree(path);
-	}
+	seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
+		   dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
 
-	if (&dev->node == &input_dev_list)
-		*eof = 1;
+	seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
+	seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
+	seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
+	seq_printf(seq, "H: Handlers=");
 
-	return (count > cnt) ? cnt : count;
+	list_for_each_entry(handle, &dev->h_list, d_node)
+		seq_printf(seq, "%s ", handle->name);
+	seq_putc(seq, '\n');
+
+	input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
+	if (test_bit(EV_KEY, dev->evbit))
+		input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
+	if (test_bit(EV_REL, dev->evbit))
+		input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
+	if (test_bit(EV_ABS, dev->evbit))
+		input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
+	if (test_bit(EV_MSC, dev->evbit))
+		input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
+	if (test_bit(EV_LED, dev->evbit))
+		input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
+	if (test_bit(EV_SND, dev->evbit))
+		input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
+	if (test_bit(EV_FF, dev->evbit))
+		input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
+	if (test_bit(EV_SW, dev->evbit))
+		input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
+
+	seq_putc(seq, '\n');
+
+	kfree(path);
+	return 0;
 }
 
-static int input_handlers_read(char *buf, char **start, off_t pos, int count, int *eof, void *data)
+static struct seq_operations input_devices_seq_ops = {
+	.start	= input_devices_seq_start,
+	.next	= input_devices_seq_next,
+	.stop	= input_devices_seq_stop,
+	.show	= input_devices_seq_show,
+};
+
+static int input_proc_devices_open(struct inode *inode, struct file *file)
 {
-	struct input_handler *handler;
+	return seq_open(file, &input_devices_seq_ops);
+}
 
-	off_t at = 0;
-	int len = 0, cnt = 0;
-	int i = 0;
+static struct file_operations input_devices_fileops = {
+	.owner		= THIS_MODULE,
+	.open		= input_proc_devices_open,
+	.poll		= input_proc_devices_poll,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= seq_release,
+};
 
-	list_for_each_entry(handler, &input_handler_list, node) {
+static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
+{
+	/* acquire lock here ... Yes, we do need locking, I knowi, I know... */
+	seq->private = (void *)(unsigned long)*pos;
+	return list_get_nth_element(&input_handler_list, pos);
+}
+
+static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	seq->private = (void *)(unsigned long)(*pos + 1);
+	return list_get_next_element(&input_handler_list, v, pos);
+}
 
-		if (handler->fops)
-			len = sprintf(buf, "N: Number=%d Name=%s Minor=%d\n",
-				i++, handler->name, handler->minor);
-		else
-			len = sprintf(buf, "N: Number=%d Name=%s\n",
-				i++, handler->name);
+static void input_handlers_seq_stop(struct seq_file *seq, void *v)
+{
+	/* release lock here */
+}
 
-		at += len;
+static int input_handlers_seq_show(struct seq_file *seq, void *v)
+{
+	struct input_handler *handler = container_of(v, struct input_handler, node);
 
-		if (at >= pos) {
-			if (!*start) {
-				*start = buf + (pos - (at - len));
-				cnt = at - pos;
-			} else  cnt += len;
-			buf += len;
-			if (cnt >= count)
-				break;
-		}
-	}
-	if (&handler->node == &input_handler_list)
-		*eof = 1;
+	seq_printf(seq, "N: Number=%ld Name=%s",
+		   (unsigned long)seq->private, handler->name);
+	if (handler->fops)
+		seq_printf(seq, " Minor=%d", handler->minor);
+	seq_putc(seq, '\n');
 
-	return (count > cnt) ? cnt : count;
+	return 0;
 }
+static struct seq_operations input_handlers_seq_ops = {
+	.start	= input_handlers_seq_start,
+	.next	= input_handlers_seq_next,
+	.stop	= input_handlers_seq_stop,
+	.show	= input_handlers_seq_show,
+};
 
-static struct file_operations input_fileops;
+static int input_proc_handlers_open(struct inode *inode, struct file *file)
+{
+	return seq_open(file, &input_handlers_seq_ops);
+}
+
+static struct file_operations input_handlers_fileops = {
+	.owner		= THIS_MODULE,
+	.open		= input_proc_handlers_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= seq_release,
+};
 
 static int __init input_proc_init(void)
 {
@@ -471,20 +514,19 @@ static int __init input_proc_init(void)
 
 	proc_bus_input_dir->owner = THIS_MODULE;
 
-	entry = create_proc_read_entry("devices", 0, proc_bus_input_dir, input_devices_read, NULL);
+	entry = create_proc_entry("devices", 0, proc_bus_input_dir);
 	if (!entry)
 		goto fail1;
 
 	entry->owner = THIS_MODULE;
-	input_fileops = *entry->proc_fops;
-	input_fileops.poll = input_devices_poll;
-	entry->proc_fops = &input_fileops;
+	entry->proc_fops = &input_devices_fileops;
 
-	entry = create_proc_read_entry("handlers", 0, proc_bus_input_dir, input_handlers_read, NULL);
+	entry = create_proc_entry("handlers", 0, proc_bus_input_dir);
 	if (!entry)
 		goto fail2;
 
 	entry->owner = THIS_MODULE;
+	entry->proc_fops = &input_handlers_fileops;
 
 	return 0;
 
@@ -512,13 +554,14 @@ static ssize_t input_dev_show_##name(struct class_device *dev, char *buf)	\
 	struct input_dev *input_dev = to_input_dev(dev);			\
 	int retval;								\
 										\
-	retval = down_interruptible(&input_dev->sem);				\
+	retval = mutex_lock_interruptible(&input_dev->mutex);			\
 	if (retval)								\
 		return retval;							\
 										\
-	retval = sprintf(buf, "%s\n", input_dev->name ? input_dev->name : "");	\
+	retval = scnprintf(buf, PAGE_SIZE,					\
+			   "%s\n", input_dev->name ? input_dev->name : "");	\
 										\
-	up(&input_dev->sem);							\
+	mutex_unlock(&input_dev->mutex);					\
 										\
 	return retval;								\
 }										\
@@ -528,46 +571,51 @@ INPUT_DEV_STRING_ATTR_SHOW(name);
 INPUT_DEV_STRING_ATTR_SHOW(phys);
 INPUT_DEV_STRING_ATTR_SHOW(uniq);
 
-static int print_modalias_bits(char *buf, int size, char prefix, unsigned long *arr,
-			       unsigned int min, unsigned int max)
+static int input_print_modalias_bits(char *buf, int size,
+				     char name, unsigned long *bm,
+				     unsigned int min_bit, unsigned int max_bit)
 {
-	int len, i;
+	int len = 0, i;
 
-	len = snprintf(buf, size, "%c", prefix);
-	for (i = min; i < max; i++)
-		if (arr[LONG(i)] & BIT(i))
-			len += snprintf(buf + len, size - len, "%X,", i);
+	len += snprintf(buf, max(size, 0), "%c", name);
+	for (i = min_bit; i < max_bit; i++)
+		if (bm[LONG(i)] & BIT(i))
+			len += snprintf(buf + len, max(size - len, 0), "%X,", i);
 	return len;
 }
 
-static int print_modalias(char *buf, int size, struct input_dev *id)
+static int input_print_modalias(char *buf, int size, struct input_dev *id,
+				int add_cr)
 {
 	int len;
 
-	len = snprintf(buf, size, "input:b%04Xv%04Xp%04Xe%04X-",
-		       id->id.bustype,
-		       id->id.vendor,
-		       id->id.product,
-		       id->id.version);
-
-	len += print_modalias_bits(buf + len, size - len, 'e', id->evbit,
-				   0, EV_MAX);
-	len += print_modalias_bits(buf + len, size - len, 'k', id->keybit,
-				   KEY_MIN_INTERESTING, KEY_MAX);
-	len += print_modalias_bits(buf + len, size - len, 'r', id->relbit,
-				   0, REL_MAX);
-	len += print_modalias_bits(buf + len, size - len, 'a', id->absbit,
-				   0, ABS_MAX);
-	len += print_modalias_bits(buf + len, size - len, 'm', id->mscbit,
-				   0, MSC_MAX);
-	len += print_modalias_bits(buf + len, size - len, 'l', id->ledbit,
-				   0, LED_MAX);
-	len += print_modalias_bits(buf + len, size - len, 's', id->sndbit,
-				   0, SND_MAX);
-	len += print_modalias_bits(buf + len, size - len, 'f', id->ffbit,
-				   0, FF_MAX);
-	len += print_modalias_bits(buf + len, size - len, 'w', id->swbit,
-				   0, SW_MAX);
+	len = snprintf(buf, max(size, 0),
+		       "input:b%04Xv%04Xp%04Xe%04X-",
+		       id->id.bustype, id->id.vendor,
+		       id->id.product, id->id.version);
+
+	len += input_print_modalias_bits(buf + len, size - len,
+				'e', id->evbit, 0, EV_MAX);
+	len += input_print_modalias_bits(buf + len, size - len,
+				'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
+	len += input_print_modalias_bits(buf + len, size - len,
+				'r', id->relbit, 0, REL_MAX);
+	len += input_print_modalias_bits(buf + len, size - len,
+				'a', id->absbit, 0, ABS_MAX);
+	len += input_print_modalias_bits(buf + len, size - len,
+				'm', id->mscbit, 0, MSC_MAX);
+	len += input_print_modalias_bits(buf + len, size - len,
+				'l', id->ledbit, 0, LED_MAX);
+	len += input_print_modalias_bits(buf + len, size - len,
+				's', id->sndbit, 0, SND_MAX);
+	len += input_print_modalias_bits(buf + len, size - len,
+				'f', id->ffbit, 0, FF_MAX);
+	len += input_print_modalias_bits(buf + len, size - len,
+				'w', id->swbit, 0, SW_MAX);
+
+	if (add_cr)
+		len += snprintf(buf + len, max(size - len, 0), "\n");
+
 	return len;
 }
 
@@ -576,9 +624,9 @@ static ssize_t input_dev_show_modalias(struct class_device *dev, char *buf)
 	struct input_dev *id = to_input_dev(dev);
 	ssize_t len;
 
-	len = print_modalias(buf, PAGE_SIZE, id);
-	len += snprintf(buf + len, PAGE_SIZE-len, "\n");
-	return len;
+	len = input_print_modalias(buf, PAGE_SIZE, id, 1);
+
+	return max_t(int, len, PAGE_SIZE);
 }
 static CLASS_DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
 
@@ -598,7 +646,7 @@ static struct attribute_group input_dev_attr_group = {
 static ssize_t input_dev_show_id_##name(struct class_device *dev, char *buf)	\
 {										\
 	struct input_dev *input_dev = to_input_dev(dev);			\
-	return sprintf(buf, "%04x\n", input_dev->id.name);			\
+	return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name);		\
 }										\
 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL);
 
@@ -620,11 +668,33 @@ static struct attribute_group input_dev_id_attr_group = {
 	.attrs	= input_dev_id_attrs,
 };
 
+static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
+			      int max, int add_cr)
+{
+	int i;
+	int len = 0;
+
+	for (i = NBITS(max) - 1; i > 0; i--)
+		if (bitmap[i])
+			break;
+
+	for (; i >= 0; i--)
+		len += snprintf(buf + len, max(buf_size - len, 0),
+				"%lx%s", bitmap[i], i > 0 ? " " : "");
+
+	if (add_cr)
+		len += snprintf(buf + len, max(buf_size - len, 0), "\n");
+
+	return len;
+}
+
 #define INPUT_DEV_CAP_ATTR(ev, bm)						\
 static ssize_t input_dev_show_cap_##bm(struct class_device *dev, char *buf)	\
 {										\
 	struct input_dev *input_dev = to_input_dev(dev);			\
-	return input_print_bitmap(buf, PAGE_SIZE, input_dev->bm##bit, ev##_MAX);\
+	int len = input_print_bitmap(buf, PAGE_SIZE,				\
+				     input_dev->bm##bit, ev##_MAX, 1);		\
+	return min_t(int, len, PAGE_SIZE);					\
 }										\
 static CLASS_DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL);
 
@@ -669,8 +739,8 @@ static void input_dev_release(struct class_device *class_dev)
  * device bitfields.
  */
 static int input_add_uevent_bm_var(char **envp, int num_envp, int *cur_index,
-				    char *buffer, int buffer_size, int *cur_len,
-				    const char *name, unsigned long *bitmap, int max)
+				   char *buffer, int buffer_size, int *cur_len,
+				   const char *name, unsigned long *bitmap, int max)
 {
 	if (*cur_index >= num_envp - 1)
 		return -ENOMEM;
@@ -678,12 +748,36 @@ static int input_add_uevent_bm_var(char **envp, int num_envp, int *cur_index,
 	envp[*cur_index] = buffer + *cur_len;
 
 	*cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0), name);
-	if (*cur_len > buffer_size)
+	if (*cur_len >= buffer_size)
 		return -ENOMEM;
 
 	*cur_len += input_print_bitmap(buffer + *cur_len,
 					max(buffer_size - *cur_len, 0),
-					bitmap, max) + 1;
+					bitmap, max, 0) + 1;
+	if (*cur_len > buffer_size)
+		return -ENOMEM;
+
+	(*cur_index)++;
+	return 0;
+}
+
+static int input_add_uevent_modalias_var(char **envp, int num_envp, int *cur_index,
+					 char *buffer, int buffer_size, int *cur_len,
+					 struct input_dev *dev)
+{
+	if (*cur_index >= num_envp - 1)
+		return -ENOMEM;
+
+	envp[*cur_index] = buffer + *cur_len;
+
+	*cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0),
+			     "MODALIAS=");
+	if (*cur_len >= buffer_size)
+		return -ENOMEM;
+
+	*cur_len += input_print_modalias(buffer + *cur_len,
+					 max(buffer_size - *cur_len, 0),
+					 dev, 0) + 1;
 	if (*cur_len > buffer_size)
 		return -ENOMEM;
 
@@ -693,7 +787,7 @@ static int input_add_uevent_bm_var(char **envp, int num_envp, int *cur_index,
 
 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...)				\
 	do {								\
-		int err = add_uevent_var(envp, num_envp, &i,	\
+		int err = add_uevent_var(envp, num_envp, &i,		\
 					buffer, buffer_size, &len,	\
 					fmt, val);			\
 		if (err)						\
@@ -709,6 +803,16 @@ static int input_add_uevent_bm_var(char **envp, int num_envp, int *cur_index,
 			return err;					\
 	} while (0)
 
+#define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev)				\
+	do {								\
+		int err = input_add_uevent_modalias_var(envp,		\
+					num_envp, &i,			\
+					buffer, buffer_size, &len,	\
+					dev);				\
+		if (err)						\
+			return err;					\
+	} while (0)
+
 static int input_dev_uevent(struct class_device *cdev, char **envp,
 			    int num_envp, char *buffer, int buffer_size)
 {
@@ -744,9 +848,7 @@ static int input_dev_uevent(struct class_device *cdev, char **envp,
 	if (test_bit(EV_SW, dev->evbit))
 		INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
 
-	envp[i++] = buffer + len;
-	len += snprintf(buffer + len, buffer_size - len, "MODALIAS=");
-	len += print_modalias(buffer + len, buffer_size - len, dev) + 1;
+	INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
 
 	envp[i] = NULL;
 	return 0;
@@ -790,7 +892,7 @@ int input_register_device(struct input_dev *dev)
 		return -EINVAL;
 	}
 
-	init_MUTEX(&dev->sem);
+	mutex_init(&dev->mutex);
 	set_bit(EV_SYN, dev->evbit);
 
 	/*