linux-kernel - [PATCH v4] MIPS: bcm63xx: let clk_disable() return immediately if clk is NULL

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Date:   Mon, 19 Sep 2016 03:04:35 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Ralf Baechle <ralf@...ux-mips.org>, linux-mips@...ux-mips.org
Cc:     Stephen Boyd <sboyd@...eaurora.org>,
        Michael Turquette <mturquette@...libre.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        linux-kernel@...r.kernel.org,
        bcm-kernel-feedback-list@...adcom.com,
        Florian Fainelli <f.fainelli@...il.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v4] MIPS: bcm63xx: let clk_disable() return immediately if clk is NULL

In many of clk_disable() implementations, it is a no-op for a NULL
pointer input, but this is one of the exceptions.

Making it treewide consistent will allow clock consumers to call
clk_disable() without NULL pointer check.

Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
---

Changes in v4:
  - Split into per-arch patches

Changes in v3:
  - Return only when clk is NULL.  Do not take care of error pointer.

Changes in v2:
  - Rebase on Linux 4.6-rc1

 arch/mips/bcm63xx/clk.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/mips/bcm63xx/clk.c b/arch/mips/bcm63xx/clk.c
index 6375652..b49fc9c 100644
--- a/arch/mips/bcm63xx/clk.c
+++ b/arch/mips/bcm63xx/clk.c
@@ -326,6 +326,9 @@ EXPORT_SYMBOL(clk_enable);
 
 void clk_disable(struct clk *clk)
 {
+	if (!clk)
+		return;
+
 	mutex_lock(&clocks_mutex);
 	clk_disable_unlocked(clk);
 	mutex_unlock(&clocks_mutex);
-- 
1.9.1