From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lan Tianyu Subject: Re: [PATCH] ACPI/Battery: Retry to get Battery information if failed during probing Date: Tue, 17 Jun 2014 09:27:54 +0800 Message-ID: <539F999A.8070902@intel.com> References: <1402552946-14704-1-git-send-email-tianyu.lan@intel.com> <53995488.20308@intel.com> <53996152.2000407@intel.com> <539A60FC.1050301@intel.com> <539E528B.90908@intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from mga14.intel.com ([192.55.52.115]:28008 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753339AbaFQB2s (ORCPT ); Mon, 16 Jun 2014 21:28:48 -0400 In-Reply-To: Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: David Rientjes Cc: rjw@rjwysocki.net, lenb@kernel.org, naszar@ya.ru, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org On 2014=E5=B9=B406=E6=9C=8817=E6=97=A5 09:27, David Rientjes wrote: > On Mon, 16 Jun 2014, Lan Tianyu wrote: >=20 >>>> How about this? >>>> >>>> - result =3D acpi_battery_update(battery, false); >>>> - if (result) >>>> + >>>> + /* >>>> + * Some machines'(E,G Lenovo Z480) ECs are not stable >>>> + * during boot up and this causes battery driver fails to = be >>>> + * probed due to failure of getting battery information >>>> + * from EC sometimes. After several retries, the operation >>>> + * may work. So add retry code here and 20ms sleep between >>>> + * every retries. >>>> + */ >>>> + while (acpi_battery_update(battery, false) && retry--) >>>> + msleep(20); >>>> + if (!retry) { >>>> + result =3D -ENODEV; >>>> goto fail; >>>> + } >>>> + >>> >>> I think you want --retry and not retry--. >> >> My original purpose is to retry 5 times after the first try fails. >> If use "--retry" here, it just retries 4 times. >> >>> Otherwise it's possible for the=20 >>> final call to acpi_battery_update() to succeed and now it's returni= ng=20 >>> -ENODEV. >>> >> >> Yes, it maybe and I will change code like the following. >> >> while ((result =3D acpi_battery_update(battery, false)) && retry--) >> msleep(20); >> if (result) >> goto fail; >> >=20 > Looks good. >=20 Great. Thanks for review. :) --=20 Best regards Tianyu Lan -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html