linux-kernel - [PATCH v4 1/7] clocksource: mips-gic: Enable the clock before using it

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Message-ID: <1438005618-27003-2-git-send-email-govindraj.raja@imgtec.com>
Date:	Mon, 27 Jul 2015 15:00:12 +0100
From:	Govindraj Raja <govindraj.raja@...tec.com>
To:	<linux-kernel@...r.kernel.org>, <linux-mips@...ux-mips.org>,
	"Daniel Lezcano" <daniel.lezcano@...aro.org>,
	<devicetree@...r.kernel.org>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Bresticker <abrestic@...omium.org>,
	James Hartley <James.Hartley@...tec.com>,
	"Govindraj Raja" <Govindraj.Raja@...tec.com>,
	Damien Horsley <Damien.Horsley@...tec.com>,
	James Hogan <James.Hogan@...tec.com>,
	Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
	Ezequiel Garcia <ezequiel.garcia@...tec.com>
Subject: [PATCH v4 1/7] clocksource: mips-gic: Enable the clock before using it

From: Ezequiel Garcia <ezequiel.garcia@...tec.com>

For the clock to be used (e.g. get its rate through clk_get_rate)
it should be prepared and enabled first.

Also, while the clock is enabled the driver must hold a reference to it,
so let's remove the call to clk_put.

Reviewed-by: Andrew Bresticker <abrestic@...omium.org>
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@...tec.com>
---
 drivers/clocksource/mips-gic-timer.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/clocksource/mips-gic-timer.c b/drivers/clocksource/mips-gic-timer.c
index b81ed1a..913585d 100644
--- a/drivers/clocksource/mips-gic-timer.c
+++ b/drivers/clocksource/mips-gic-timer.c
@@ -158,8 +158,13 @@ static void __init gic_clocksource_of_init(struct device_node *node)
 
 	clk = of_clk_get(node, 0);
 	if (!IS_ERR(clk)) {
+		if (clk_prepare_enable(clk) < 0) {
+			pr_err("GIC failed to enable clock\n");
+			clk_put(clk);
+			return;
+		}
+
 		gic_frequency = clk_get_rate(clk);
-		clk_put(clk);
 	} else if (of_property_read_u32(node, "clock-frequency",
 					&gic_frequency)) {
 		pr_err("GIC frequency not specified.\n");
-- 
1.9.1

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