linux-kernel - [PATCH 5/9] drivers: clk: st: Fix flexgen lock init

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Date:	Tue, 23 Jun 2015 16:09:23 +0200
From:	Gabriel Fernandez <gabriel.fernandez@...aro.org>
To:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Srinivas Kandagatla <srinivas.kandagatla@...il.com>,
	Maxime Coquelin <maxime.coquelin@...com>,
	Patrice Chotard <patrice.chotard@...com>,
	Russell King <linux@....linux.org.uk>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Gabriel Fernandez <gabriel.fernandez@...aro.org>,
	Peter Griffin <peter.griffin@...aro.org>,
	Pankaj Dev <pankaj.dev@...com>,
	Olivier Bideau <olivier.bideau@...com>,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Fabian Frederick <fabf@...net.be>
Cc:	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, kernel@...inux.com,
	linux-clk@...r.kernel.org
Subject: [PATCH 5/9] drivers: clk: st: Fix flexgen lock init

From: Giuseppe Cavallaro <peppe.cavallaro@...com>

While proving lock, the following warning happens
and it is fixed after initializing lock in the setup
function

INFO: trying to register non-static key.
the code is fine but needs lockdep annotation.
turning off the locking correctness validator.
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.10.27-02861-g39df285-dirty #33
[<c00154ac>] (unwind_backtrace+0x0/0xf4) from [<c0011b50>] (show_stack+0x10/0x14)
[<c0011b50>] (show_stack+0x10/0x14) from [<c00689ac>] (__lock_acquire+0x900/0xb14)
[<c00689ac>] (__lock_acquire+0x900/0xb14) from [<c0069394>] (lock_acquire+0x68/0x7c)
[<c0069394>] (lock_acquire+0x68/0x7c) from [<c04958f8>] (_raw_spin_lock_irqsave+0x48/0x5c)
[<c04958f8>] (_raw_spin_lock_irqsave+0x48/0x5c) from [<c0381e6c>] (clk_gate_endisable+0x28/0x88)
[<c0381e6c>] (clk_gate_endisable+0x28/0x88) from [<c0381ee0>] (clk_gate_enable+0xc/0x14)
[<c0381ee0>] (clk_gate_enable+0xc/0x14) from [<c0386c68>] (flexgen_enable+0x28/0x40)
[<c0386c68>] (flexgen_enable+0x28/0x40) from [<c037f260>] (__clk_enable+0x5c/0x9c)
[<c037f260>] (__clk_enable+0x5c/0x9c) from [<c037f558>] (clk_enable+0x18/0x2c)
[<c037f558>] (clk_enable+0x18/0x2c) from [<c064a1dc>] (st_lpc_of_register+0xc0/0x248)
[<c064a1dc>] (st_lpc_of_register+0xc0/0x248) from [<c0649e44>] (clocksource_of_init+0x34/0x58)
[<c0649e44>] (clocksource_of_init+0x34/0x58) from [<c0637ddc>] (sti_timer_init+0x10/0x18)
[<c0637ddc>] (sti_timer_init+0x10/0x18) from [<c06343f8>] (time_init+0x20/0x30)
[<c06343f8>] (time_init+0x20/0x30) from [<c0632984>] (start_kernel+0x20c/0x2e8)
[<c0632984>] (start_kernel+0x20c/0x2e8) from [<40008074>] (0x40008074)

Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@...com>
Signed-off-by: Gabriel Fernandez <gabriel.fernandez@...aro.org>
---
 drivers/clk/st/clk-flexgen.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/clk/st/clk-flexgen.c b/drivers/clk/st/clk-flexgen.c
index 657ca14..be06d2a 100644
--- a/drivers/clk/st/clk-flexgen.c
+++ b/drivers/clk/st/clk-flexgen.c
@@ -303,6 +303,8 @@ static void __init st_of_flexgen_setup(struct device_node *np)
 	if (!rlock)
 		goto err;
 
+	spin_lock_init(rlock);
+
 	for (i = 0; i < clk_data->clk_num; i++) {
 		struct clk *clk;
 		const char *clk_name;
-- 
1.9.1

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