linux-kernel - Re: [PATCH 4/4] platform/x86: wmi: Fix notify callback locking

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Date: Thu, 4 Jan 2024 20:15:54 +0200 (EET)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Armin Wolf <W_Armin@....de>
cc: Hans de Goede <hdegoede@...hat.com>, platform-driver-x86@...r.kernel.org, 
    LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/4] platform/x86: wmi: Fix notify callback locking

On Wed, 3 Jan 2024, Armin Wolf wrote:

> When an legacy WMI event handler is removed, an WMI event could
> have called the handler just before it was removed, meaning the
> handler could still be running after wmi_remove_notify_handler()
> returns.
> Something similar could also happens when using the WMI bus, as
> the WMI core might still call the notify() callback from an WMI
> driver even if its remove() callback was just called.
> 
> Fix this by introducing a rw semaphore which ensures that the
> event state of a WMI device does not change while the WMI core
> is handling an event for it.
> 
> Tested on a Dell Inspiron 3505 and a Acer Aspire E1-731.
> 
> Fixes: 1686f5444546 ("platform/x86: wmi: Incorporate acpi_install_notify_handler")
> Signed-off-by: Armin Wolf <W_Armin@....de>

Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>

-- 
 i.