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Message-Id: <1459821083-28116-1-git-send-email-yamada.masahiro@socionext.com>
Date: Tue, 5 Apr 2016 10:51:23 +0900
From: Masahiro Yamada <yamada.masahiro@...ionext.com>
To: linux-clk@...r.kernel.org
Cc: Stephen Boyd <sboyd@...eaurora.org>,
Ralf Baechle <ralf@...ux-mips.org>,
Michael Turquette <mturquette@...libre.com>,
Masahiro Yamada <yamada.masahiro@...ionext.com>,
linux-mips@...ux-mips.org, linux-sh@...r.kernel.org,
Haojian Zhuang <haojian.zhuang@...il.com>,
Eric Miao <eric.y.miao@...il.com>,
Hartley Sweeten <hsweeten@...ionengravers.com>,
Greg Ungerer <gerg@...inux.org>,
Ryan Mallon <rmallon@...il.com>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
Steven Miao <realmz6@...il.com>,
Simon Horman <horms@...ge.net.au>,
Wan ZongShun <mcuos.com@...il.com>,
Rich Felker <dalias@...c.org>,
Yoshinori Sato <ysato@...rs.sourceforge.jp>,
adi-buildroot-devel@...ts.sourceforge.net,
Russell King <linux@....linux.org.uk>,
linux-m68k@...ts.linux-m68k.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
linux-renesas-soc@...r.kernel.org,
Magnus Damm <magnus.damm@...il.com>,
John Crispin <blogic@...nwrt.org>
Subject: [PATCH v2] clk: let clk_disable() return immediately if clk is NULL or error
The clk_disable() in the common clock framework (drivers/clk/clk.c)
returns immediately if a given clk is NULL or an error pointer. It
allows clock consumers to call clk_disable() without IS_ERR_OR_NULL
checking if drivers are only used with the common clock framework.
Unfortunately, NULL/error checking is missing from some of non-common
clk_disable() implementations. This prevents us from completely
dropping NULL/error checking from callers. Let's make it tree-wide
consistent by adding IS_ERR_OR_NULL(clk) to all callees.
Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
Acked-by: Greg Ungerer <gerg@...inux.org>
Acked-by: Wan Zongshun <mcuos.com@...il.com>
---
Stephen,
This patch has been unapplied for a long time.
Please let me know if there is something wrong with this patch.
Thanks,
Changes in v2:
- Rebase on Linux 4.6-rc1
arch/arm/mach-ep93xx/clock.c | 2 +-
arch/arm/mach-mmp/clock.c | 3 +++
arch/arm/mach-sa1100/clock.c | 15 ++++++++-------
arch/arm/mach-w90x900/clock.c | 3 +++
arch/blackfin/mach-bf609/clock.c | 3 +++
arch/m68k/coldfire/clk.c | 4 ++++
arch/mips/bcm63xx/clk.c | 3 +++
arch/mips/lantiq/clk.c | 3 +++
drivers/sh/clk/core.c | 2 +-
9 files changed, 29 insertions(+), 9 deletions(-)
diff --git a/arch/arm/mach-ep93xx/clock.c b/arch/arm/mach-ep93xx/clock.c
index 39ef3b6..4e11f7d 100644
--- a/arch/arm/mach-ep93xx/clock.c
+++ b/arch/arm/mach-ep93xx/clock.c
@@ -293,7 +293,7 @@ void clk_disable(struct clk *clk)
{
unsigned long flags;
- if (!clk)
+ if (IS_ERR_OR_NULL(clk))
return;
spin_lock_irqsave(&clk_lock, flags);
diff --git a/arch/arm/mach-mmp/clock.c b/arch/arm/mach-mmp/clock.c
index ac6633d..39ad3896 100644
--- a/arch/arm/mach-mmp/clock.c
+++ b/arch/arm/mach-mmp/clock.c
@@ -67,6 +67,9 @@ void clk_disable(struct clk *clk)
{
unsigned long flags;
+ if (IS_ERR_OR_NULL(clk))
+ return;
+
WARN_ON(clk->enabled == 0);
spin_lock_irqsave(&clocks_lock, flags);
diff --git a/arch/arm/mach-sa1100/clock.c b/arch/arm/mach-sa1100/clock.c
index cbf53bb..ea103fd 100644
--- a/arch/arm/mach-sa1100/clock.c
+++ b/arch/arm/mach-sa1100/clock.c
@@ -85,13 +85,14 @@ void clk_disable(struct clk *clk)
{
unsigned long flags;
- if (clk) {
- WARN_ON(clk->enabled == 0);
- spin_lock_irqsave(&clocks_lock, flags);
- if (--clk->enabled == 0)
- clk->ops->disable(clk);
- spin_unlock_irqrestore(&clocks_lock, flags);
- }
+ if (IS_ERR_OR_NULL(clk))
+ return;
+
+ WARN_ON(clk->enabled == 0);
+ spin_lock_irqsave(&clocks_lock, flags);
+ if (--clk->enabled == 0)
+ clk->ops->disable(clk);
+ spin_unlock_irqrestore(&clocks_lock, flags);
}
EXPORT_SYMBOL(clk_disable);
diff --git a/arch/arm/mach-w90x900/clock.c b/arch/arm/mach-w90x900/clock.c
index 2c371ff..90ec250 100644
--- a/arch/arm/mach-w90x900/clock.c
+++ b/arch/arm/mach-w90x900/clock.c
@@ -46,6 +46,9 @@ void clk_disable(struct clk *clk)
{
unsigned long flags;
+ if (IS_ERR_OR_NULL(clk))
+ return;
+
WARN_ON(clk->enabled == 0);
spin_lock_irqsave(&clocks_lock, flags);
diff --git a/arch/blackfin/mach-bf609/clock.c b/arch/blackfin/mach-bf609/clock.c
index 3783058..fed8015 100644
--- a/arch/blackfin/mach-bf609/clock.c
+++ b/arch/blackfin/mach-bf609/clock.c
@@ -97,6 +97,9 @@ EXPORT_SYMBOL(clk_enable);
void clk_disable(struct clk *clk)
{
+ if (IS_ERR_OR_NULL(clk))
+ return;
+
if (clk->ops && clk->ops->disable)
clk->ops->disable(clk);
}
diff --git a/arch/m68k/coldfire/clk.c b/arch/m68k/coldfire/clk.c
index fddfdcc..eb0e8c1 100644
--- a/arch/m68k/coldfire/clk.c
+++ b/arch/m68k/coldfire/clk.c
@@ -101,6 +101,10 @@ EXPORT_SYMBOL(clk_enable);
void clk_disable(struct clk *clk)
{
unsigned long flags;
+
+ if (IS_ERR_OR_NULL(clk))
+ return;
+
spin_lock_irqsave(&clk_lock, flags);
if ((--clk->enabled == 0) && clk->clk_ops)
clk->clk_ops->disable(clk);
diff --git a/arch/mips/bcm63xx/clk.c b/arch/mips/bcm63xx/clk.c
index 6375652..d6a39bf 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 (IS_ERR_OR_NULL(clk))
+ return;
+
mutex_lock(&clocks_mutex);
clk_disable_unlocked(clk);
mutex_unlock(&clocks_mutex);
diff --git a/arch/mips/lantiq/clk.c b/arch/mips/lantiq/clk.c
index a0706fd..c8d87b1 100644
--- a/arch/mips/lantiq/clk.c
+++ b/arch/mips/lantiq/clk.c
@@ -130,6 +130,9 @@ EXPORT_SYMBOL(clk_enable);
void clk_disable(struct clk *clk)
{
+ if (IS_ERR_OR_NULL(clk))
+ return;
+
if (unlikely(!clk_good(clk)))
return;
diff --git a/drivers/sh/clk/core.c b/drivers/sh/clk/core.c
index 92863e3..9978fa4 100644
--- a/drivers/sh/clk/core.c
+++ b/drivers/sh/clk/core.c
@@ -252,7 +252,7 @@ void clk_disable(struct clk *clk)
{
unsigned long flags;
- if (!clk)
+ if (IS_ERR_OR_NULL(clk))
return;
spin_lock_irqsave(&clock_lock, flags);
--
1.9.1
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