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Date: Sat, 5 Dec 2015 15:17:56 +0900
From: Masahiro Yamada <yamada.masahiro@...ionext.com>
To: linux-clk@...r.kernel.org
Cc: 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>,
Ralf Baechle <ralf@...ux-mips.org>,
Hauke Mehrtens <hauke@...ke-m.de>,
adi-buildroot-devel@...ts.sourceforge.net,
Russell King <linux@....linux.org.uk>,
linux-m68k@...ts.linux-m68k.org, Roland Stigge <stigge@...com.de>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
Magnus Damm <magnus.damm@...il.com>,
John Crispin <blogic@...nwrt.org>
Subject: [PATCH] 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 the given clk is NULL or an error pointer.
It allows drivers to call clk_disable() (and clk_disable_unprepare())
with a clock that might be NULL or an error pointer as long as the
drivers are only used along 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 from callers. Let's add IS_ERR_OR_NULL(clk)
checks to all callees.
Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
---
arch/arm/mach-ep93xx/clock.c | 2 +-
arch/arm/mach-lpc32xx/clock.c | 3 +++
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 +-
10 files changed, 32 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-lpc32xx/clock.c b/arch/arm/mach-lpc32xx/clock.c
index 661c8f4..07faac2 100644
--- a/arch/arm/mach-lpc32xx/clock.c
+++ b/arch/arm/mach-lpc32xx/clock.c
@@ -1125,6 +1125,9 @@ void clk_disable(struct clk *clk)
{
unsigned long flags;
+ if (IS_ERR_OR_NULL(clk))
+ return;
+
spin_lock_irqsave(&global_clkregs_lock, flags);
local_clk_disable(clk);
spin_unlock_irqrestore(&global_clkregs_lock, flags);
diff --git a/arch/arm/mach-mmp/clock.c b/arch/arm/mach-mmp/clock.c
index 7c6f95f..7b33122 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 be56b22..3dd20cf 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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