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From: Sean Young <sean@mess.org>
To: linux-media@vger.kernel.org
Subject: [PATCH] media: rc: ensure that uevent can be read directly after rc device register
Date: Mon, 21 Dec 2020 09:19:29 +0000
Message-ID: <20201221091929.26504-1-sean@mess.org> (raw)

There is a race condition where if the /sys/class/rc0/uevent file is read
before rc_dev->registered is set to true, -ENODEV will be returned.

Fixes: a2e2d73fa281 ("media: rc: do not access device via sysfs after rc_unregister_device()")

Signed-off-by: Sean Young <sean@mess.org>
---
 drivers/media/rc/rc-main.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/media/rc/rc-main.c b/drivers/media/rc/rc-main.c
index 1d811e5ffb55..29d4d01896ff 100644
--- a/drivers/media/rc/rc-main.c
+++ b/drivers/media/rc/rc-main.c
@@ -1928,6 +1928,8 @@ int rc_register_device(struct rc_dev *dev)
 			goto out_raw;
 	}
 
+	dev->registered = true;
+
 	rc = device_add(&dev->dev);
 	if (rc)
 		goto out_rx_free;
@@ -1937,8 +1939,6 @@ int rc_register_device(struct rc_dev *dev)
 		 dev->device_name ?: "Unspecified device", path ?: "N/A");
 	kfree(path);
 
-	dev->registered = true;
-
 	/*
 	 * once the the input device is registered in rc_setup_rx_device,
 	 * userspace can open the input device and rc_open() will be called
-- 
2.29.2


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