avr32: handle NULL as a valid clock object

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.shevchenko@linux.intel.com>
Acked-by: Hans-Christian Egtvedt <egtvedt@samfundet.no>

diff --git a/arch/avr32/mach-at32ap/clock.c b/arch/avr32/mach-at32ap/clock.c
index 23b1a97fae7ad686acc581c5888e95d5e4928a1e..52c179bec0cc6c69d4430324a0a581f66e066a6d 100644 (file)
--- 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);