From: Jason Gunthorpe <jgg@nvidia.com>
To: Bob Pearson <rpearsonhpe@gmail.com>
Cc: zyjzyj2000@gmail.com, linux-rdma@vger.kernel.org
Subject: Re: [PATCH for-next 6/6] RDMA/rxe: Fix potential race condition in rxe_pool
Date: Wed, 20 Oct 2021 20:23:01 -0300 [thread overview]
Message-ID: <20211020232301.GA28827@nvidia.com> (raw)
In-Reply-To: <20211010235931.24042-7-rpearsonhpe@gmail.com>
On Sun, Oct 10, 2021 at 06:59:31PM -0500, Bob Pearson wrote:
> diff --git a/drivers/infiniband/sw/rxe/rxe_pool.h b/drivers/infiniband/sw/rxe/rxe_pool.h
> index ad287c4ddc1a..43dac03ad82e 100644
> +++ b/drivers/infiniband/sw/rxe/rxe_pool.h
> @@ -132,9 +132,20 @@ void *rxe_pool_get_key(struct rxe_pool *pool, void *key);
> void rxe_elem_release(struct kref *kref);
>
> /* take a reference on an object */
> -#define rxe_add_ref(elem) kref_get(&(elem)->pelem.ref_cnt)
> +static inline int __rxe_add_ref(struct rxe_pool_entry *elem)
> +{
> + int ret = kref_get_unless_zero(&elem->ref_cnt);
> +
> + if (unlikely(!ret))
> + pr_warn("Taking a reference on a %s object that is already destroyed\n",
> + elem->pool->name);
There is already debugging prints for this built into the kref, you
don't need to open code them
Jason
next prev parent reply other threads:[~2021-10-20 23:23 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-10 23:59 [PATCH for-next 0/6] RDMA/rxe: Fix potential races Bob Pearson
2021-10-10 23:59 ` [PATCH for-next 1/6] RDMA/rxe: Make rxe_alloc() take pool lock Bob Pearson
2021-10-20 23:16 ` Jason Gunthorpe
2021-10-21 17:46 ` Bob Pearson
2021-10-25 12:43 ` Jason Gunthorpe
2021-10-25 18:48 ` Robert Pearson
2021-10-10 23:59 ` [PATCH for-next 2/6] RDMA/rxe: Copy setup parameters into rxe_pool Bob Pearson
2021-10-10 23:59 ` [PATCH for-next 3/6] RDMA/rxe: Save object pointer in pool element Bob Pearson
2021-10-20 23:20 ` Jason Gunthorpe
2021-10-21 17:21 ` Bob Pearson
2021-10-25 15:40 ` Jason Gunthorpe
2021-10-10 23:59 ` [PATCH for-next 4/6] RDMA/rxe: Combine rxe_add_index with rxe_alloc Bob Pearson
2021-10-10 23:59 ` [PATCH for-next 5/6] RDMA/rxe: Combine rxe_add_key " Bob Pearson
2021-10-10 23:59 ` [PATCH for-next 6/6] RDMA/rxe: Fix potential race condition in rxe_pool Bob Pearson
2021-10-20 23:23 ` Jason Gunthorpe [this message]
2021-10-12 6:34 ` [PATCH for-next 0/6] RDMA/rxe: Fix potential races Leon Romanovsky
2021-10-12 20:19 ` Bob Pearson
2021-10-19 13:07 ` Leon Romanovsky
2021-10-19 16:35 ` Bob Pearson
2021-10-19 18:43 ` Jason Gunthorpe
2021-10-19 22:51 ` Bob Pearson
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