From e91c255733d9bbb4978a372f44fb5ed689ccdbd1 Mon Sep 17 00:00:00 2001 From: Hans Verkuil Date: Fri, 9 Oct 2020 11:16:16 +0200 Subject: [PATCH] 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 Signed-off-by: Mauro Carvalho Chehab --- drivers/media/cec/core/cec-core.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/media/cec/core/cec-core.c b/drivers/media/cec/core/cec-core.c index ece236291f35..551689d371a7 100644 --- 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); -- 2.20.1