media: cec-core: first mark device unregistered, then wake up fhs

If a CEC device node is unregistered, then it should be marked as
unregistered before waking up any filehandles that are waiting for
an event.

This ensures that there is no race condition where an application can
call CEC_DQEVENT and have the ioctl return 0 instead of ENODEV.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

diff --git a/drivers/media/cec/core/cec-core.c b/drivers/media/cec/core/cec-core.c
index ece236291f3586236ba1e36ed8af81a1b2057564..551689d371a712555d03e33647f272720d9fb8cd 100644 (file)
--- a/drivers/media/cec/core/cec-core.c
+++ b/drivers/media/cec/core/cec-core.c
@@ -166,12 +166,12 @@ static void cec_devnode_unregister(struct cec_adapter *adap)
                mutex_unlock(&devnode->lock);
                return;
        }
+       devnode->registered = false;
+       devnode->unregistered = true;
 
        list_for_each_entry(fh, &devnode->fhs, list)
                wake_up_interruptible(&fh->wait);
 
-       devnode->registered = false;
-       devnode->unregistered = true;
        mutex_unlock(&devnode->lock);
 
        mutex_lock(&adap->lock);