On 08/20/2013 10:30 PM, Russell King - ARM Linux wrote:
> 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()
My bad, will remove that.
>> +
>> + 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;
Ok, that should work too.
>> +
>> + 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.
I wouldn't be surprised to see some callers with ERR pointers, since
clk_put() has been mostly a no op. I'm inclined to leave such a check
temporarily, let's see if it catches any issues.
Thanks for review of the other patches.
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