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Commit 843e784a authored by Dmitry Torokhov's avatar Dmitry Torokhov
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Input: serio_raw - perform proper locking when adding clients to list 



Make sure we hold serio lock when adding clients to client list so that
we do not race with serio_raw_release() removing clients from the same
list.

Reviewed-by: default avatarWanlong Gao <gaowanlong@cn.fujitsu.com>
Signed-off-by: default avatarDmitry Torokhov <dtor@mail.ru>
parent 7c5bbb2e

drivers/input/serio/serio_raw.c

+5 −3
Original line number Diff line number Diff line
@@ -106,7 +106,10 @@ static int serio_raw_open(struct inode *inode, struct file *file) 
	file->private_data = client;



	kref_get(&serio_raw->kref);



	serio_pause_rx(serio_raw->serio);

	list_add_tail(&client->node, &serio_raw->client_list);

	serio_continue_rx(serio_raw->serio);



out:

	mutex_unlock(&serio_raw_mutex);
@@ -138,10 +141,9 @@ static int serio_raw_release(struct inode *inode, struct file *file) 


static int serio_raw_fetch_byte(struct serio_raw *serio_raw, char *c)

{

	unsigned long flags;

	int empty;



	spin_lock_irqsave(&serio_raw->serio->lock, flags);

	serio_pause_rx(serio_raw->serio);



	empty = serio_raw->head == serio_raw->tail;

	if (!empty) {
@@ -149,7 +151,7 @@ static int serio_raw_fetch_byte(struct serio_raw *serio_raw, char *c) 
		serio_raw->tail = (serio_raw->tail + 1) % SERIO_RAW_QUEUE_LEN;

	}



	spin_unlock_irqrestore(&serio_raw->serio->lock, flags);

	serio_continue_rx(serio_raw->serio);



	return !empty;

}