openwrt/target/linux/ar7/patches-4.9/101-MIPS-AR7-allow-NULL-clock-for-clk_get_rate.patch

From patchwork Tue Jul 18 10:17:26 2017
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Subject: [5/9] MIPS: AR7: allow NULL clock for clk_get_rate
X-Patchwork-Submitter: Jonas Gorski <jonas.gorski@gmail.com>
X-Patchwork-Id: 16775
Message-Id: <20170718101730.2541-6-jonas.gorski@gmail.com>
To: unlisted-recipients:; (no To-header on input)
Cc: Ralf Baechle <ralf@linux-mips.org>,
 Paul Gortmaker <paul.gortmaker@windriver.com>,
 James Hogan <james.hogan@imgtec.com>,
 linux-mips@linux-mips.org, linux-kernel@vger.kernel.org
Date: Tue, 18 Jul 2017 12:17:26 +0200
From: Jonas Gorski <jonas.gorski@gmail.com>
List-Id: linux-mips <linux-mips.eddie.linux-mips.org>

Make the behaviour of clk_get_rate consistent with common clk's
clk_get_rate by accepting NULL clocks as parameter. Some device
drivers rely on this, and will cause an OOPS otherwise.

Fixes: 780019ddf02f ("MIPS: AR7: Implement clock API")
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Reported-by: Mathias Kresin <dev@kresin.me>
Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
---
 arch/mips/ar7/clock.c | 3 +++
 1 file changed, 3 insertions(+)

--- a/arch/mips/ar7/clock.c
+++ b/arch/mips/ar7/clock.c
@@ -430,6 +430,9 @@ EXPORT_SYMBOL(clk_disable);
 
 unsigned long clk_get_rate(struct clk *clk)
 {
+	if (!clk)
+		return 0;
+
 	return clk->rate;
 }
 EXPORT_SYMBOL(clk_get_rate);