From: Dong Aisheng <aisheng.dong@freescale.com>
Date: Wed, 15 Apr 2015 14:26:36 +0000 (+0800)
Subject: clk: add missing lock when call clk_core_enable in clk_set_parent
X-Git-Tag: omap-for-v4.3/legacy-v2-signed~327^2~3
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d2a5d46b167a9a8231264daf80165b739aecf1d7;p=pandora-kernel.git

clk: add missing lock when call clk_core_enable in clk_set_parent

Before commit 035a61c314eb ("clk: Make clk API return per-user
struct clk instances") we acquired the enable_lock in
__clk_set_parent_{before,after}() by means of calling
clk_enable(). After commit 035a61c314eb we use clk_core_enable()
in place of the clk_enable(), and clk_core_enable() doesn't
acquire the enable_lock. This opens up a race condition between
clk_set_parent() and clk_enable(). Fix it.

Fixes: 035a61c314eb ("clk: Make clk API return per-user struct clk instances")
Cc: Mike Turquette <mturquette@linaro.org>
Cc: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Dong Aisheng <aisheng.dong@freescale.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
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