Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756536AbcCUPNj (ORCPT ); Mon, 21 Mar 2016 11:13:39 -0400 Received: from mail-qg0-f65.google.com ([209.85.192.65]:33575 "EHLO mail-qg0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756299AbcCUPNf convert rfc822-to-8bit (ORCPT ); Mon, 21 Mar 2016 11:13:35 -0400 MIME-Version: 1.0 In-Reply-To: <20160321121736.GH8413@pali> References: <1457740175-8327-1-git-send-email-gabriele.mzt@gmail.com> <1458341063-8753-1-git-send-email-gabriele.mzt@gmail.com> <20160321121736.GH8413@pali> Date: Mon, 21 Mar 2016 16:13:34 +0100 Message-ID: Subject: Re: [PATCH v3] dell-rbtn: Ignore ACPI notifications if device is suspended From: Gabriele Mazzotta To: =?UTF-8?Q?Pali_Roh=C3=A1r?= Cc: Darren Hart , "D. Jared Dominguez" , "platform-driver-x86@vger.kernel.org" , "Rafael J. Wysocki" , Alex Hung , Andrei Borzenkov , "linux-kernel@vger.kernel.org" Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1770 Lines: 54 2016-03-21 13:17 GMT+01:00 Pali Rohár : > On Friday 18 March 2016 23:44:23 Gabriele Mazzotta wrote: >> +#ifdef CONFIG_PM_SLEEP >> +static void ACPI_SYSTEM_XFACE rbtn_acpi_clear_flag(void *context) >> +{ >> + struct rbtn_data *rbtn_data = context; >> + >> + rbtn_data->suspended = false; >> +} >> + >> +static int rbtn_suspend(struct device *dev) >> +{ >> + struct acpi_device *device = to_acpi_device(dev); >> + struct rbtn_data *rbtn_data = acpi_driver_data(device); >> + >> + rbtn_data->suspended = true; >> + >> + return 0; >> +} >> + >> +static int rbtn_resume(struct device *dev) >> +{ >> + struct acpi_device *device = to_acpi_device(dev); >> + struct rbtn_data *rbtn_data = acpi_driver_data(device); >> + acpi_status status; >> + >> + /* >> + * Clear the flag only after we received the extra >> + * ACPI notification. >> + */ >> + status = acpi_os_execute(OSL_NOTIFY_HANDLER, >> + rbtn_acpi_clear_flag, rbtn_data); >> + if (ACPI_FAILURE(status)) >> + rbtn_data->suspended = false; > > I case when acpi_os_execute success it calls rbtn_acpi_clear_flag, > right? And that will set suspended to false. When acpi_os_execute fails, > then it set suspended too to false... Then whole acpi_os_execute doing > just "barrier" after which suspended flag can be set to false. So I > think rbtn_acpi_clear_flag function is not needed here. > > Cannot you pass NULL or empty function pointer as callback? Or what was > reason to do that flag clearing at "two places"? acpi_os_execute doesn't wait for the callback to be executed, so I can't clear the flag from rbtn_resume. >> + return 0; >> +} >> +#endif > > -- > Pali Rohár > pali.rohar@gmail.com