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drivers: sh: clk: Avoid crashes when passing NULL clocks 

Several clock API functions handle NULL clocks when the Common Clock
Framework is used, while their legacy SH counterparts don't, and would
just crash when a NULL clock is passed.

Add NULL checks to clk_get_rate(), clk_set_rate(), clk_get_parent(), and
clk_round_rate(), to avoid different behavior in drivers shared between
legacy and CCF-based platforms.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
hifive-unleashed-5.1
Geert Uytterhoeven 2015-11-19 19:32:06 +01:00 committed by Simon Horman
parent 90069ad1b6
commit 6575a9c69a
1 changed files with 12 additions and 0 deletions
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12
drivers/sh/clk/core.c
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@ -469,6 +469,9 @@ void clk_enable_init_clocks(void)
unsigned long clk_get_rate(struct clk *clk)
{
if (!clk)
return 0;
return clk->rate;
}
EXPORT_SYMBOL_GPL(clk_get_rate);
@ -478,6 +481,9 @@ int clk_set_rate(struct clk *clk, unsigned long rate)
int ret = -EOPNOTSUPP;
unsigned long flags;
if (!clk)
return 0;
spin_lock_irqsave(&clock_lock, flags);
if (likely(clk->ops && clk->ops->set_rate)) {
@ -535,12 +541,18 @@ EXPORT_SYMBOL_GPL(clk_set_parent);
struct clk *clk_get_parent(struct clk *clk)
{
if (!clk)
return NULL;
return clk->parent;
}
EXPORT_SYMBOL_GPL(clk_get_parent);
long clk_round_rate(struct clk *clk, unsigned long rate)
{
if (!clk)
return 0;
if (likely(clk->ops && clk->ops->round_rate)) {
unsigned long flags, rounded;