linux-kernel - [PATCH 3.19.y-ckt 048/107] drivers: clk: st: Fix flexgen lock init

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Message-Id: <1438811379-384-49-git-send-email-kamal@canonical.com>
Date:	Wed,  5 Aug 2015 14:48:40 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Giuseppe Cavallaro <peppe.cavallaro@...com>,
	Gabriel Fernandez <gabriel.fernandez@...aro.org>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 048/107] drivers: clk: st: Fix flexgen lock init

3.19.8-ckt5 -stable review patch.  If anyone has any objections, please let me know.

------------------

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

commit 0f4f2afd4402883a51ad27a1d9e046643bb1e3cb upstream.

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>
Fixes: b116517055b7 ("clk: st: STiH407: Support for Flexgen Clocks")
Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 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 2282cef..97aa50a 100644
--- a/drivers/clk/st/clk-flexgen.c
+++ b/drivers/clk/st/clk-flexgen.c
@@ -292,6 +292,8 @@ 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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