linux-kernel - Re: [PATCH v1 5/5] rtc: rtc-cmos: Disable ACPI RTC event on removal

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Message-ID: <Y2l2hid1SSAzpKhS@smile.fi.intel.com>
Date:   Mon, 7 Nov 2022 23:20:06 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     Alexandre Belloni <alexandre.belloni@...tlin.com>,
        linux-rtc@...r.kernel.org, Linux ACPI <linux-acpi@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Alessandro Zummo <a.zummo@...ertech.it>
Subject: Re: [PATCH v1 5/5] rtc: rtc-cmos: Disable ACPI RTC event on removal

On Mon, Nov 07, 2022 at 09:03:06PM +0100, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> Make cmos_do_remove() drop the ACPI RTC fixed event handler so as to
> prevent it from operating on stale data in case the event triggers
> after driver removal.
> 
> While at it, make cmos_do_remove() also clear the driver data pointer
> of the device and make cmos_acpi_wake_setup() do that in the error path
> too.

...

> +	dev_set_drvdata(dev, NULL);

> +	dev_set_drvdata(dev, NULL);

Maybe I'm missing something, but the cmos_do_remove() is called by ->remove()
callback of the real drivers (pnp and platform) and device core is already
doing this. So, don't know why you need these calls to be explicit.

-- 
With Best Regards,
Andy Shevchenko