[PATCH 1/1] avr32: handle NULL as a valid clock object

[Andy Shevchenko]

Since NULL is used as valid clock object on optional clocks we have to handle
this case in avr32 implementation as well.

Fixes: e1824dfe0d8e (net: macb: Adjust tx_clk when link speed changes)
Signed-off-by: Andy Shevchenko <andriy.shevche...@linux.intel.com>
---
 arch/avr32/mach-at32ap/clock.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/arch/avr32/mach-at32ap/clock.c b/arch/avr32/mach-at32ap/clock.c
index 23b1a97..52c179b 100644
--- a/arch/avr32/mach-at32ap/clock.c
+++ b/arch/avr32/mach-at32ap/clock.c
@@ -80,6 +80,9 @@ int clk_enable(struct clk *clk)
 {
        unsigned long flags;
 
+       if (!clk)
+               return 0;
+
        spin_lock_irqsave(&clk_lock, flags);
        __clk_enable(clk);
        spin_unlock_irqrestore(&clk_lock, flags);
@@ -106,6 +109,9 @@ void clk_disable(struct clk *clk)
 {
        unsigned long flags;
 
+       if (IS_ERR_OR_NULL(clk))
+               return;
+
        spin_lock_irqsave(&clk_lock, flags);
        __clk_disable(clk);
        spin_unlock_irqrestore(&clk_lock, flags);
@@ -117,6 +123,9 @@ unsigned long clk_get_rate(struct clk *clk)
        unsigned long flags;
        unsigned long rate;
 
+       if (!clk)
+               return 0;
+
        spin_lock_irqsave(&clk_lock, flags);
        rate = clk->get_rate(clk);
        spin_unlock_irqrestore(&clk_lock, flags);
@@ -129,6 +138,9 @@ long clk_round_rate(struct clk *clk, unsigned long rate)
 {
        unsigned long flags, actual_rate;
 
+       if (!clk)
+               return 0;
+
        if (!clk->set_rate)
                return -ENOSYS;
 
@@ -145,6 +157,9 @@ int clk_set_rate(struct clk *clk, unsigned long rate)
        unsigned long flags;
        long ret;
 
+       if (!clk)
+               return 0;
+
        if (!clk->set_rate)
                return -ENOSYS;
 
@@ -161,6 +176,9 @@ int clk_set_parent(struct clk *clk, struct clk *parent)
        unsigned long flags;
        int ret;
 
+       if (!clk)
+               return 0;
+
        if (!clk->set_parent)
                return -ENOSYS;
 
@@ -174,7 +192,7 @@ EXPORT_SYMBOL(clk_set_parent);
 
 struct clk *clk_get_parent(struct clk *clk)
 {
-       return clk->parent;
+       return !clk ? NULL : clk->parent;
 }
 EXPORT_SYMBOL(clk_get_parent);
 
-- 
2.4.6

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