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 [thread overview]
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
reply other threads:[~2020-12-21 10:16 UTC|newest]
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