From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrei Borzenkov Subject: Re: [PATCH v2] dell-rbtn: Ignore ACPI notifications if device is suspended Date: Fri, 18 Mar 2016 18:57:33 +0300 Message-ID: <56EC256D.9000004@gmail.com> References: <1457740175-8327-1-git-send-email-gabriele.mzt@gmail.com> <20160314114525.GK8413@pali> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from mail-lb0-f194.google.com ([209.85.217.194]:36012 "EHLO mail-lb0-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757340AbcCRP5i (ORCPT ); Fri, 18 Mar 2016 11:57:38 -0400 In-Reply-To: <20160314114525.GK8413@pali> Sender: platform-driver-x86-owner@vger.kernel.org List-ID: To: =?UTF-8?Q?Pali_Roh=c3=a1r?= , Gabriele Mazzotta , "Rafael J. Wysocki" Cc: "D. Jared Dominguez" , "platform-driver-x86@vger.kernel.org" , Alex Hung , "linux-kernel@vger.kernel.org" 14.03.2016 14:45, Pali Roh=C3=A1r =D0=BF=D0=B8=D1=88=D0=B5=D1=82: > On Monday 14 March 2016 12:34:31 Gabriele Mazzotta wrote: >> 2016-03-12 0:49 GMT+01:00 Gabriele Mazzotta = : >>> Some BIOSes unconditionally send an ACPI notification to RBTN when = the >>> system is resuming from suspend. This makes dell-rbtn send an input >>> event to userspace as if a function key was pressed. Prevent this b= y >>> ignoring all the notifications received while the device is suspend= ed. >>> >>> Link: https://bugzilla.kernel.org/show_bug.cgi?id=3D106031 >>> Signed-off-by: Gabriele Mazzotta >>> --- >>> drivers/platform/x86/dell-rbtn.c | 41 ++++++++++++++++++++++++++++= ++++++++++++ >>> 1 file changed, 41 insertions(+) >>> >>> diff --git a/drivers/platform/x86/dell-rbtn.c b/drivers/platform/x8= 6/dell-rbtn.c >>> index cd410e3..56b0da7 100644 >>> --- a/drivers/platform/x86/dell-rbtn.c >>> +++ b/drivers/platform/x86/dell-rbtn.c >>> @@ -28,6 +28,7 @@ struct rbtn_data { >>> enum rbtn_type type; >>> struct rfkill *rfkill; >>> struct input_dev *input_dev; >>> + bool suspended; >>> }; >>> >>> >>> @@ -220,9 +221,44 @@ static const struct acpi_device_id rbtn_ids[] = =3D { >>> { "", 0 }, >>> }; >>> >>> +#ifdef CONFIG_PM_SLEEP >>> +static void ACPI_SYSTEM_XFACE rbtn_acpi_clear_flag(void *context) >>> +{ >>> + struct rbtn_data *rbtn_data =3D context; >>> + >>> + rbtn_data->suspended =3D false; >>> +} >>> + >>> +static int rbtn_suspend(struct device *dev) >>> +{ >>> + struct acpi_device *device =3D to_acpi_device(dev); >>> + struct rbtn_data *rbtn_data =3D acpi_driver_data(device); >>> + >>> + rbtn_data->suspended =3D true; >>> + >>> + return 0; >>> +} >>> + >>> +static int rbtn_resume(struct device *dev) >>> +{ >>> + struct acpi_device *device =3D to_acpi_device(dev); >>> + struct rbtn_data *rbtn_data =3D acpi_driver_data(device); >>> + acpi_status status; >>> + >>> + status =3D acpi_os_execute(OSL_NOTIFY_HANDLER, >>> + rbtn_acpi_clear_flag, rbtn_data); >>> + if (ACPI_FAILURE(status)) >>> + rbtn_data->suspended =3D false; >>> + >>> + return 0; >>> +} >>> +#endif >>> +static SIMPLE_DEV_PM_OPS(rbtn_pm_ops, rbtn_suspend, rbtn_resume); >>> + >>> static struct acpi_driver rbtn_driver =3D { >>> .name =3D "dell-rbtn", >>> .ids =3D rbtn_ids, >>> + .drv.pm =3D &rbtn_pm_ops, >>> .ops =3D { >>> .add =3D rbtn_add, >>> .remove =3D rbtn_remove, >>> @@ -384,6 +420,11 @@ static void rbtn_notify(struct acpi_device *de= vice, u32 event) >>> { >>> struct rbtn_data *rbtn_data =3D device->driver_data; >>> >>> + if (rbtn_data->suspended) { >>> + dev_dbg(&device->dev, "ACPI notification ignored\n"= ); >>> + return; >>> + } >>> + >>> if (event !=3D 0x80) { >>> dev_info(&device->dev, "Received unknown event (0x%= x)\n", >>> event); >>> -- >>> 2.7.0 >>> >> >> I'm sorry, Pali, I must have missed your email address while sending >> this updated version. >=20 > For me patch looks OK. I would suggest to add some comment about BIOS > into code too. >=20 > Rafael, can you review that ACPI suspended/OSL_NOTIFY_HANDLER part? >=20 > Andrei, can you test if it now really fix it on your machine? >=20 TBH I'm still unsure if this fixes root cause or just decreases race window, but so far after multiple suspend/resume cycles on my Dell Latitude E5450 WiFi was restored every time. So Tested-By: Andrei Borzenkov