On Tue, Aug 20, 2013 at 07:34:20PM +0200, Sylwester Nawrocki wrote:
> +int __clk_get(struct clk *clk)
> +{
> + if (WARN_ON((!clk)))
> + return 0;
This changes the behaviour of clk_get()
> +
> + if (!try_module_get(clk->owner))
> + return 0;
If you want this to be safe against NULL pointers, just do this:
if (clk && !try_module_get(clk->owner))
return 0;
> +
> + return 1;
> +}
> +EXPORT_SYMBOL(__clk_get);
> +
> +void __clk_put(struct clk *clk)
> +{
> + if (!clk || IS_ERR(clk))
> + return;
> +
> + module_put(clk->owner);
Calling clk_put() with an error-pointer should be a Bad Thing and something
that shouldn't be encouraged, so trapping it is probably unwise. So, just
do here:
if (clk)
module_put(clk->owner);
If we do have some callers of this with ERR pointers, then we could add:
if (WARN_ON_ONCE(IS_ERR(clk)))
return;
and remove it after a full kernel cycle or so.
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