Commit 48f98f75 authored by Janne Grunau's avatar Janne Grunau Committed by Mauro Carvalho Chehab

V4L/DVB (11231): hdpvr: locking fixes

unlock io_mutex in hdpvr_stop_streaming hdpvr_disconnect to allow the
streaming worker to stop before we flush the workqueue.
do not return to user space with mutex held in vidioc_encoder_cmd with
an unknown encoder command.
Signed-off-by: default avatarJanne Grunau <j@jannau.net>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent d2ff3ec8
......@@ -390,8 +390,10 @@ static void hdpvr_disconnect(struct usb_interface *interface)
video_unregister_device(dev->video_dev);
wake_up_interruptible(&dev->wait_data);
wake_up_interruptible(&dev->wait_buffer);
mutex_unlock(&dev->io_mutex);
msleep(100);
flush_workqueue(dev->workqueue);
mutex_lock(&dev->io_mutex);
hdpvr_cancel_queue(dev);
destroy_workqueue(dev->workqueue);
mutex_unlock(&dev->io_mutex);
......
......@@ -300,12 +300,14 @@ static int hdpvr_stop_streaming(struct hdpvr_device *dev)
dev->status = STATUS_SHUTTING_DOWN;
hdpvr_config_call(dev, CTRL_STOP_STREAMING_VALUE, 0x00);
mutex_unlock(&dev->io_mutex);
wake_up_interruptible(&dev->wait_buffer);
msleep(50);
flush_workqueue(dev->workqueue);
mutex_lock(&dev->io_mutex);
/* kill the still outstanding urbs */
hdpvr_cancel_queue(dev);
......@@ -1130,7 +1132,7 @@ static int vidioc_encoder_cmd(struct file *filp, void *priv,
default:
v4l2_dbg(MSG_INFO, hdpvr_debug, dev->video_dev,
"Unsupported encoder cmd %d\n", a->cmd);
return -EINVAL;
res = -EINVAL;
}
mutex_unlock(&dev->io_mutex);
return res;
......
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