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
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Subject: [5/9] MIPS: AR7: allow NULL clock for clk_get_rate
X-Patchwork-Submitter: Jonas Gorski <[email protected]>
X-Patchwork-Id: 16775
Message-Id: <[email protected]>
To: unlisted-recipients:; (no To-header on input)
Cc: Ralf Baechle <[email protected]>,
 Paul Gortmaker <[email protected]>,
 James Hogan <[email protected]>,
 [email protected], [email protected]
Date: Tue, 18 Jul 2017 12:17:26 +0200
From: Jonas Gorski <[email protected]>
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 <[email protected]>
Cc: Paul Gortmaker <[email protected]>
Cc: James Hogan <[email protected]>
Cc: [email protected]
Cc: [email protected]
Reported-by: Mathias Kresin <[email protected]>
Signed-off-by: Jonas Gorski <[email protected]>
---
 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);