linux-kernel - Re: [PATCH 07/10] Pass the return value of kref

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Date:   Mon, 22 Jul 2019 17:31:20 +0200
From:   Maksym Planeta <mplaneta@...inf.tu-dresden.de>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     Moni Shoua <monis@...lanox.com>,
        Doug Ledford <dledford@...hat.com>, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 07/10] Pass the return value of kref_put further

In a later patch I need to know if the dependency to QP object still 
exists or not.

On 22/07/2019 17:29, Jason Gunthorpe wrote:
> On Mon, Jul 22, 2019 at 05:14:23PM +0200, Maksym Planeta wrote:
>> Used in a later patch.
>>
>> Signed-off-by: Maksym Planeta <mplaneta@...inf.tu-dresden.de>
>>   drivers/infiniband/sw/rxe/rxe_pool.c | 3 ++-
>>   drivers/infiniband/sw/rxe/rxe_pool.h | 2 +-
>>   2 files changed, 3 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/infiniband/sw/rxe/rxe_pool.c b/drivers/infiniband/sw/rxe/rxe_pool.c
>> index 30a887cf9200..711d7d7f3692 100644
>> +++ b/drivers/infiniband/sw/rxe/rxe_pool.c
>> @@ -541,7 +541,7 @@ static void rxe_dummy_release(struct kref *kref)
>>   {
>>   }
>>   
>> -void rxe_drop_ref(struct rxe_pool_entry *pelem)
>> +int rxe_drop_ref(struct rxe_pool_entry *pelem)
>>   {
>>   	int res;
>>   	struct rxe_pool *pool = pelem->pool;
>> @@ -553,4 +553,5 @@ void rxe_drop_ref(struct rxe_pool_entry *pelem)
>>   	if (res) {
>>   		rxe_elem_release(&pelem->ref_cnt);
>>   	}
>> +	return res;
>>   }
> 
> Using the return value of kref_put at all is super sketchy. Are you
> sure this is actually a kref usage pattern?
> 
> Why would this be needed?
> 
> Jason
> 

-- 
Regards,
Maksym Planeta