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clk: Correct handling of NULL clk in __clk_{get, put} 

Ensure clk->kref is dereferenced only when clk is not NULL.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Tested-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
This commit is contained in:
Sylwester Nawrocki 2014-01-07 13:03:43 +01:00 committed by Mike Turquette
parent 624009a7f3
commit 00efcb1c8e
1 changed files with 7 additions and 6 deletions
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13
drivers/clk/clk.c
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@ -2226,24 +2226,25 @@ EXPORT_SYMBOL_GPL(devm_clk_unregister);
*/
int __clk_get(struct clk *clk)
{
if (clk && !try_module_get(clk->owner))
return 0;
if (clk) {
if (!try_module_get(clk->owner))
return 0;
kref_get(&clk->ref);
kref_get(&clk->ref);
}
return 1;
}
void __clk_put(struct clk *clk)
{
if (WARN_ON_ONCE(IS_ERR(clk)))
if (!clk || WARN_ON_ONCE(IS_ERR(clk)))
return;
clk_prepare_lock();
kref_put(&clk->ref, __clk_release);
clk_prepare_unlock();
if (clk)
module_put(clk->owner);
module_put(clk->owner);
}
/*** clk rate change notifiers ***/