[PATCH 3.14 26/29] avr32: handle NULL as a valid clock object

[Greg Kroah-Hartman]

3.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Andy Shevchenko <andriy.shevche...@linux.intel.com>

commit 5c02a4206538da12c040b51778d310df84c6bf6c upstream.

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>
Acked-by: Hans-Christian Egtvedt <egtv...@samfundet.no>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 arch/avr32/mach-at32ap/clock.c |   20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

--- 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 *c
        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, uns
 {
        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, unsign
        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, stru
        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);
 


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