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media: rc: ensure that uevent can be read directly after rc device register

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commit 896111dc4b upstream.

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.

Link: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1901089

Cc: stable@vger.kernel.org
Fixes: a2e2d73fa2 ("media: rc: do not access device via sysfs after rc_unregister_device()")
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sean Young 2020-12-20 13:29:54 +01:00 committed by Greg Kroah-Hartman
parent ce9e154a8b
commit b3b75f8cd1
1 changed files with 2 additions and 2 deletions
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4
drivers/media/rc/rc-main.c
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@ -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