Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755190AbaFLGDv (ORCPT ); Thu, 12 Jun 2014 02:03:51 -0400 Received: from mga09.intel.com ([134.134.136.24]:2922 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754586AbaFLGDu (ORCPT ); Thu, 12 Jun 2014 02:03:50 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.01,462,1400050800"; d="scan'208";a="527245288" From: Lan Tianyu To: rjw@rjwysocki.net, lenb@kernel.org, naszar@ya.ru Cc: Lan Tianyu , linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH] ACPI/Battery: Retry to get Battery information if failed during probing Date: Thu, 12 Jun 2014 14:02:26 +0800 Message-Id: <1402552946-14704-1-git-send-email-tianyu.lan@intel.com> X-Mailer: git-send-email 1.7.9.5 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Some machines'(E,G Lenovo Z480) ECs are not stable during boot up and causes battery driver fails to be probed due to failure of getting battery information from EC sometimes. After several retries, the operation will work. This patch is to retry to get battery information 5 times if the first try fails. Reported-and-tested-by: naszar Reference: https://bugzilla.kernel.org/show_bug.cgi?id=75581 Cc: stable@vger.kernel.org Signed-off-by: Lan Tianyu --- drivers/acpi/battery.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c index e48fc98..485009d 100644 --- a/drivers/acpi/battery.c +++ b/drivers/acpi/battery.c @@ -34,6 +34,7 @@ #include #include #include +#include #include #ifdef CONFIG_ACPI_PROCFS_POWER @@ -1119,7 +1120,7 @@ static struct dmi_system_id bat_dmi_table[] = { static int acpi_battery_add(struct acpi_device *device) { - int result = 0; + int result = 0, retry = 5; struct acpi_battery *battery = NULL; if (!device) @@ -1135,7 +1136,16 @@ static int acpi_battery_add(struct acpi_device *device) mutex_init(&battery->sysfs_lock); if (acpi_has_method(battery->device->handle, "_BIX")) set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags); + +retry_get_info: result = acpi_battery_update(battery, false); + + if (result && retry) { + msleep(20); + retry--; + goto retry_get_info; + } + if (result) goto fail; #ifdef CONFIG_ACPI_PROCFS_POWER -- 1.8.4.rc0.1.g8f6a3e5.dirty -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/