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

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Date:   Mon, 22 Jul 2019 12:29:47 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Maksym Planeta <mplaneta@...inf.tu-dresden.de>
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

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