From: Patrick Mochel <mochel@osdl.org>
Date: Mon, 26 Aug 2002 10:39:29 +0000 (-0700)
Subject: Use standard linked lists in input layer
X-Git-Tag: v2.5.32~9^2~1
X-Git-Url: http://git.neil.brown.name/?a=commitdiff_plain;h=541d91b86da4563b365130fe13085a4710b876b0;p=history.git

Use standard linked lists in input layer
- Replace struct input_dev::handle with a standard linked list
- Replace struct input_handler::handle with a standard linked list
- Replace struct input_handle's next pointers with struct list_heads
- Update users of the lists
- Add macros for converting from the struct list_head to various types
---

diff --git a/drivers/char/keyboard.c b/drivers/char/keyboard.c
index 5a2366135791..8edc6c983de9 100644
--- a/drivers/char/keyboard.c
+++ b/drivers/char/keyboard.c
@@ -130,11 +130,16 @@ static struct ledptr {
  */
 int getkeycode(unsigned int scancode)
 {
-	struct input_handle *handle;
+	struct list_head * node;
 	struct input_dev *dev = NULL;
 
-	for (handle = kbd_handler.handle; handle; handle = handle->hnext) 
-		if (handle->dev->keycodesize) { dev = handle->dev; break; }
+	list_for_each(node,&kbd_handler.h_list) {
+		struct input_handle * handle = to_handle_h(node);
+		if (handle->dev->keycodesize) { 
+			dev = handle->dev; 
+			break;
+		}
+	}
 
 	if (!dev)
 		return -ENODEV;
@@ -147,12 +152,17 @@ int getkeycode(unsigned int scancode)
 
 int setkeycode(unsigned int scancode, unsigned int keycode)
 {
-	struct input_handle *handle;
+	struct list_head * node;
 	struct input_dev *dev = NULL;
 	int i, oldkey;
 
-	for (handle = kbd_handler.handle; handle; handle = handle->hnext) 
-		if (handle->dev->keycodesize) { dev = handle->dev; break; }
+	list_for_each(node,&kbd_handler.h_list) {
+		struct input_handle *handle = to_handle_h(node);
+		if (handle->dev->keycodesize) { 
+			dev = handle->dev; 
+			break; 
+		}
+	}
 
 	if (!dev)
 		return -ENODEV;
@@ -178,27 +188,30 @@ int setkeycode(unsigned int scancode, unsigned int keycode)
  */
 static void kd_nosound(unsigned long ignored)
 {
-	struct input_handle *handle;
+	struct list_head * node;
 
-	for (handle = kbd_handler.handle; handle; handle = handle->hnext)
+	list_for_each(node,&kbd_handler.h_list) {
+		struct input_handle *handle = to_handle_h(node);
 		if (test_bit(EV_SND, handle->dev->evbit)) {
 			if (test_bit(SND_TONE, handle->dev->sndbit))
 				input_event(handle->dev, EV_SND, SND_TONE, 0);
 			if (test_bit(SND_BELL, handle->dev->sndbit))
 				input_event(handle->dev, EV_SND, SND_BELL, 0);
 		}
+	}
 }
 
 static struct timer_list kd_mksound_timer = { function: kd_nosound };
 
 void kd_mksound(unsigned int hz, unsigned int ticks)
 {
-	struct input_handle *handle;
+	struct list_head * node;
 
 	del_timer(&kd_mksound_timer);
 
 	if (hz) {
-		for (handle = kbd_handler.handle; handle; handle = handle->hnext)
+		list_for_each(node,&kbd_handler.h_list) {
+			struct input_handle *handle = to_handle_h(node);
 			if (test_bit(EV_SND, handle->dev->evbit)) {
 				if (test_bit(SND_TONE, handle->dev->sndbit)) {
 					input_event(handle->dev, EV_SND, SND_TONE, hz);
@@ -209,6 +222,7 @@ void kd_mksound(unsigned int hz, unsigned int ticks)
 					break;
 				}
 			}
+		}
 		if (ticks)
 			mod_timer(&kd_mksound_timer, jiffies + ticks);
 	} else
@@ -220,12 +234,13 @@ void kd_mksound(unsigned int hz, unsigned int ticks)
  */
 int kbd_rate(struct kbd_repeat *rep)
 {
-	struct input_handle *handle;
+	struct list_head * node;
 
 	if (rep->rate < 0 || rep->delay < 0)
 		return -EINVAL;
 
-	for (handle = kbd_handler.handle; handle; handle = handle->hnext)
+	list_for_each(node,&kbd_handler.h_list) {
+		struct input_handle *handle = to_handle_h(node);
 		if (test_bit(EV_REP, handle->dev->evbit)) {
 			if (rep->rate > HZ) rep->rate = HZ;
 			handle->dev->rep[REP_PERIOD] = rep->rate ? (HZ / rep->rate) : 0;
@@ -233,7 +248,7 @@ int kbd_rate(struct kbd_repeat *rep)
 			if (handle->dev->rep[REP_DELAY] < handle->dev->rep[REP_PERIOD])
 				handle->dev->rep[REP_DELAY] = handle->dev->rep[REP_PERIOD];
 		}
-	
+	}
 	return 0;
 }
 
@@ -843,11 +858,12 @@ static inline unsigned char getleds(void)
 
 static void kbd_bh(unsigned long dummy)
 {
-	struct input_handle *handle;	
+	struct list_head * node;
 	unsigned char leds = getleds();
 
 	if (leds != ledstate) {
-		for (handle = kbd_handler.handle; handle; handle = handle->hnext) {
+		list_for_each(node,&kbd_handler.h_list) {
+			struct input_handle * handle = to_handle_h(node);
 			input_event(handle->dev, EV_LED, LED_SCROLLL, !!(leds & 0x01));
 			input_event(handle->dev, EV_LED, LED_NUML,    !!(leds & 0x02));
 			input_event(handle->dev, EV_LED, LED_CAPSL,   !!(leds & 0x04));
diff --git a/drivers/input/input.c b/drivers/input/input.c
index 7660c3ff43fb..37d3689743bc 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -70,9 +70,10 @@ DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
 static int input_devices_state;
 #endif
 
+
 void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
 {
-	struct input_handle *handle = dev->handle;
+	struct list_head * node;
 
 	if (dev->pm_dev)
 		pm_access(dev->pm_dev);
@@ -191,10 +192,10 @@ void input_event(struct input_dev *dev, unsigned int type, unsigned int code, in
 	if (type != EV_SYN) 
 		dev->sync = 0;
 
-	while (handle) {
+	list_for_each(node,&dev->h_list) {
+		struct input_handle *handle = to_handle(node);
 		if (handle->open)
 			handle->handler->event(handle, type, code, value);
-		handle = handle->dnext;
 	}
 }
 
@@ -248,41 +249,8 @@ void input_close_device(struct input_handle *handle)
 
 static void input_link_handle(struct input_handle *handle)
 {
-	handle->dnext = handle->dev->handle;
-	handle->hnext = handle->handler->handle;
-	handle->dev->handle = handle;
-	handle->handler->handle = handle;
-}
-
-/**
- *     input_find_and_remove - Find and remove node
- *
- *     @type:          data type
- *     @initval:       initial value
- *     @targ:          node to find
- *     @next:          next node in the list
- *
- *     Searches the linked list for the target node @targ. If the node
- *     is found, it is removed from the list.
- *
- *     If the node is not found, the end of the list will be hit,
- *     indicating that it wasn't in the list to begin with.
- *
- *     Returns nothing.
- */
-
-#define input_find_and_remove(type, initval, targ, next)		\
-	do {								\
-		type **ptr;						\
-		for (ptr = &initval; *ptr; ptr = &((*ptr)->next))	\
-			if (*ptr == targ) break;			\
-		if (*ptr) *ptr = (*ptr)->next;				\
-	} while (0)
-
-static void input_unlink_handle(struct input_handle *handle)
-{
-	input_find_and_remove(struct input_handle, handle->dev->handle, handle, dnext);
-        input_find_and_remove(struct input_handle, handle->handler->handle, handle, hnext);
+	list_add_tail(&handle->d_node,&handle->dev->h_list);
+	list_add_tail(&handle->h_node,&handle->handler->h_list);
 }
 
 #define MATCH_BIT(bit, max) \
@@ -466,13 +434,14 @@ void input_register_device(struct input_dev *dev)
 /*
  * Add the device.
  */
+	INIT_LIST_HEAD(&dev->h_list);
 	list_add_tail(&dev->node,&input_dev_list);
 
 /*
  * Notify handlers.
  */
 	list_for_each(node,&input_handler_list) {
-		struct input_handler *handler = container_of(node,struct input_handler,node);
+		struct input_handler *handler = to_handler(node);
 		if ((id = input_match_device(handler->id_table, dev)))
 			if ((handle = handler->connect(handler, dev, id)))
 				input_link_handle(handle);
@@ -498,8 +467,7 @@ void input_register_device(struct input_dev *dev)
 
 void input_unregister_device(struct input_dev *dev)
 {
-	struct input_handle *handle = dev->handle;
-	struct input_handle *dnext;
+	struct list_head * node, * next;
 
 	if (!dev) return;
 
@@ -519,11 +487,11 @@ void input_unregister_device(struct input_dev *dev)
  * Notify handlers.
  */
 
-	while (handle) {
-		dnext = handle->dnext;
-		input_unlink_handle(handle);
+	list_for_each_safe(node,next,&dev->h_list) {
+		struct input_handle * handle = to_handle(node);
+		list_del_init(&handle->d_node);
+		list_del_init(&handle->h_node);
 		handle->handler->disconnect(handle);
-		handle = dnext;
 	}
 
 /*
@@ -557,6 +525,7 @@ void input_register_handler(struct input_handler *handler)
 
 	if (!handler) return;
 
+	INIT_LIST_HEAD(&handler->h_list);
 /*
  * Add minors if needed.
  */
@@ -574,7 +543,7 @@ void input_register_handler(struct input_handler *handler)
  */
 
 	list_for_each(node,&input_dev_list) {
-		struct input_dev *dev = container_of(node,struct input_dev,node);
+		struct input_dev *dev = to_dev(node);
 		if ((id = input_match_device(handler->id_table, dev)))
 			if ((handle = handler->connect(handler, dev, id)))
 				input_link_handle(handle);
@@ -592,18 +561,17 @@ void input_register_handler(struct input_handler *handler)
 
 void input_unregister_handler(struct input_handler *handler)
 {
-	struct input_handle *handle = handler->handle;
-	struct input_handle *hnext;
+	struct list_head * node, * next;
+
 
 /*
  * Tell the handler to disconnect from all devices it keeps open.
  */
-
-	while (handle) {
-		hnext = handle->hnext;
-		input_unlink_handle(handle);
+	list_for_each_safe(node,next,&handler->h_list) {
+		struct input_handle * handle = to_handle_h(node);
+		list_del_init(&handle->h_node);
+		list_del_init(&handle->d_node);
 		handler->disconnect(handle);
-		handle = hnext;
 	}
 
 /*
@@ -711,13 +679,13 @@ static unsigned int input_devices_poll(struct file *file, poll_table *wait)
 static int input_devices_read(char *buf, char **start, off_t pos, int count, int *eof, void *data)
 {
 	struct list_head * node;
-	struct input_handle *handle;
 
 	off_t at = 0;
 	int i, len, cnt = 0;
 
 	list_for_each(node,&input_dev_list) {
-		struct input_dev *dev = container_of(node,struct input_dev,node);
+		struct input_dev * dev = to_dev(node);
+		struct list_head * hnode;
 
 		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);
@@ -726,11 +694,9 @@ static int input_devices_read(char *buf, char **start, off_t pos, int count, int
 		len += sprintf(buf + len, "P: Phys=%s\n", dev->phys ? dev->phys : "");
 		len += sprintf(buf + len, "D: Drivers=");
 
-		handle = dev->handle;
-
-		while (handle) {
+		list_for_each(hnode,&dev->h_list) {
+			struct input_handle * handle = to_handle(hnode);
 			len += sprintf(buf + len, "%s ", handle->name);
-			handle = handle->dnext;
 		}
 
 		len += sprintf(buf + len, "\n");
@@ -774,7 +740,7 @@ static int input_handlers_read(char *buf, char **start, off_t pos, int count, in
 	int i = 0;
 
 	list_for_each(node,&input_handler_list) {
-		struct input_handler *handler = container_of(node,struct input_handler,node);
+		struct input_handler *handler = to_handler(node);
 
 		if (handler->fops)
 			len = sprintf(buf, "N: Number=%d Name=%s Minor=%d\n",
diff --git a/drivers/input/mousedev.c b/drivers/input/mousedev.c
index 44929cbd2aec..f1808270fab9 100644
--- a/drivers/input/mousedev.c
+++ b/drivers/input/mousedev.c
@@ -200,8 +200,9 @@ static int mousedev_release(struct inode * inode, struct file * file)
 
 	if (!--list->mousedev->open) {
 		if (list->mousedev->minor == MOUSEDEV_MIX) {
-			struct input_handle *handle = mousedev_handler.handle;
-			while (handle) {
+			struct list_head * node;
+			list_for_each(node,&mousedev_handler.h_list) {
+				struct input_handle *handle = to_handle_h(node);
 				struct mousedev *mousedev = handle->private;
 				if (!mousedev->open) {
 					if (mousedev->exist) {
@@ -212,7 +213,6 @@ static int mousedev_release(struct inode * inode, struct file * file)
 						kfree(mousedev);
 					}
 				}
-				handle = handle->hnext;
 			}
 		} else {
 			if (!mousedev_mix.open) {
@@ -258,13 +258,13 @@ static int mousedev_open(struct inode * inode, struct file * file)
 
 	if (!list->mousedev->open++) {
 		if (list->mousedev->minor == MOUSEDEV_MIX) {
-			struct input_handle *handle = mousedev_handler.handle;
-			while (handle) {
+			struct list_head * node;
+			list_for_each(node,&mousedev_handler.h_list) {
+				struct input_handle *handle = to_handle_h(node);
 				struct mousedev *mousedev = handle->private;
 				if (!mousedev->open)
 					if (mousedev->exist)	
 						input_open_device(handle);
-				handle = handle->hnext;
 			}
 		} else {
 			if (!mousedev_mix.open)
diff --git a/include/linux/input.h b/include/linux/input.h
index c99710c658ec..ade9c87a955d 100644
--- a/include/linux/input.h
+++ b/include/linux/input.h
@@ -811,7 +811,7 @@ struct input_dev {
 	int (*upload_effect)(struct input_dev *dev, struct ff_effect *effect);
 	int (*erase_effect)(struct input_dev *dev, int effect_id);
 
-	struct input_handle *handle;
+	struct list_head	h_list;
 	struct list_head	node;
 };
 
@@ -856,6 +856,8 @@ struct input_device_id {
 	unsigned long driver_info;
 };
 
+struct input_handle;
+
 struct input_handler {
 
 	void *private;
@@ -870,7 +872,7 @@ struct input_handler {
 
 	struct input_device_id *id_table;
 
-	struct input_handle *handle;
+	struct list_head	h_list;
 	struct list_head	node;
 };
 
@@ -884,10 +886,15 @@ struct input_handle {
 	struct input_dev *dev;
 	struct input_handler *handler;
 
-	struct input_handle *dnext;
-	struct input_handle *hnext;
+	struct list_head	d_node;
+	struct list_head	h_node;
 };
 
+#define to_dev(n) container_of(n,struct input_dev,node)
+#define to_handler(n) container_of(n,struct input_handler,node);
+#define to_handle(n) container_of(n,struct input_handle,d_node)
+#define to_handle_h(n) container_of(n,struct input_handle,h_node)
+
 void input_register_device(struct input_dev *);
 void input_unregister_device(struct input_dev *);