diff options
| -rw-r--r-- | drivers/input/evdev.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c index 88d8e4cb419a..75c4e8683033 100644 --- a/drivers/input/evdev.c +++ b/drivers/input/evdev.c @@ -41,6 +41,7 @@ struct evdev { struct evdev_client { unsigned int head; unsigned int tail; + unsigned int packet_head; /* [future] position of the first element of next packet */ spinlock_t buffer_lock; /* protects access to buffer, head and tail */ struct fasync_struct *fasync; struct evdev *evdev; @@ -72,12 +73,16 @@ static void evdev_pass_event(struct evdev_client *client, client->buffer[client->tail].type = EV_SYN; client->buffer[client->tail].code = SYN_DROPPED; client->buffer[client->tail].value = 0; - } - spin_unlock(&client->buffer_lock); + client->packet_head = client->tail; + } - if (event->type == EV_SYN) + if (event->type == EV_SYN && event->code == SYN_REPORT) { + client->packet_head = client->head; kill_fasync(&client->fasync, SIGIO, POLL_IN); + } + + spin_unlock(&client->buffer_lock); } /* @@ -387,12 +392,12 @@ static ssize_t evdev_read(struct file *file, char __user *buffer, if (count < input_event_size()) return -EINVAL; - if (client->head == client->tail && evdev->exist && + if (client->packet_head == client->tail && evdev->exist && (file->f_flags & O_NONBLOCK)) return -EAGAIN; retval = wait_event_interruptible(evdev->wait, - client->head != client->tail || !evdev->exist); + client->packet_head != client->tail || !evdev->exist); if (retval) return retval; @@ -421,7 +426,7 @@ static unsigned int evdev_poll(struct file *file, poll_table *wait) poll_wait(file, &evdev->wait, wait); mask = evdev->exist ? POLLOUT | POLLWRNORM : POLLHUP | POLLERR; - if (client->head != client->tail) + if (client->packet_head != client->tail) mask |= POLLIN | POLLRDNORM; return mask; |