From 6c91403e65acb0f4c32b59bb15a3e10044bbb37f Mon Sep 17 00:00:00 2001
From: Lan Tianyu <tianyu.lan@intel.com>
Date: Mon, 7 Jul 2014 15:47:12 +0800
Subject: [PATCH] ACPI / battery: Retry to get battery information if failed
 during probing

commit 75646e758a0ecbed5024454507d5be5b9ea9dcbf upstream.

Some machines (eg. Lenovo Z480) ECs are not stable during boot up
and causes battery driver fails to be loaded 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.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=75581
Reported-and-tested-by: naszar <naszar@ya.ru>
Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
[bwh: Backported to 3.2: acpi_battery_update() doesn't take a second parameter]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
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