Subject: [PATCH 2/7] omap: mailbox: check for NULL nb in mailbox_put

From: [email-masked] (Suman Anna)
Date: Mon, 10 Jun 2013 12:38:26 -0500

Russ,

On 06/08/2013 01:46 PM, Russ Dill wrote:
> On Fri, Jun 7, 2013 at 6:57 PM, Suman Anna <[email-masked]> wrote:
>> The mailbox_put function must check the notifier block for
>> NULL before trying to unregister it.
> 
> I'm going to nack this one. Why must it check for NULL? None of the
> callers pass a NULL argument and blocking_notifier_chain_unregister
> handles a NULL nb argument just fine.

Thanks for the review. It should have been done differently, which is to
print an error trace if the passed in arguments are NULL. Anyway, I will
drop this since I expect this function to go away once this is adapted
to the new framework.

regards
Suman

> 
>> Signed-off-by: Fernando Guzman Lugo <[email-masked]>
>> Signed-off-by: Suman Anna <[email-masked]>
>> ---
>>  arch/arm/plat-omap/mailbox.c | 3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/arm/plat-omap/mailbox.c b/arch/arm/plat-omap/mailbox.c
>> index 42377ef..5fb4027 100644
>> --- a/arch/arm/plat-omap/mailbox.c
>> +++ b/arch/arm/plat-omap/mailbox.c
>> @@ -356,7 +356,8 @@ EXPORT_SYMBOL(omap_mbox_get);
>>
>>  void omap_mbox_put(struct omap_mbox *mbox, struct notifier_block *nb)
>>  {
>> -       blocking_notifier_chain_unregister(&mbox->notifier, nb);
>> +       if (nb)
>> +               blocking_notifier_chain_unregister(&mbox->notifier, nb);
>>         omap_mbox_fini(mbox);
>>  }
>>  EXPORT_SYMBOL(omap_mbox_put);
>> --
>> 1.8.2
>>
>> --
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