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From: Bob Pearson <rpearsonhpe@gmail.com>
To: jgg@nvidia.com, zyjzyj2000@gmail.com, jhack@hpe.com,
	matsuda-daisuke@fujitsu.com, linux-rdma@vger.kernel.org
Cc: Bob Pearson <rpearsonhpe@gmail.com>
Subject: [PATCH for-next v3 2/8] RDMA/rxe: Warn if refcnt zero in rxe_put
Date: Sat,  4 Mar 2023 11:45:28 -0600	[thread overview]
Message-ID: <20230304174533.11296-3-rpearsonhpe@gmail.com> (raw)
In-Reply-To: <20230304174533.11296-1-rpearsonhpe@gmail.com>

This patch adds a WARN_ON if the reference count of the object
passed to __rxe_put() is <= 0. This can only happen if there is a
bug in the rxe driver but has bad consequences if there is.

Signed-off-by: Bob Pearson <rpearsonhpe@gmail.com>
---
 drivers/infiniband/sw/rxe/rxe_pool.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/infiniband/sw/rxe/rxe_pool.c b/drivers/infiniband/sw/rxe/rxe_pool.c
index 3f6bd672cc2d..1b160e36b751 100644
--- a/drivers/infiniband/sw/rxe/rxe_pool.c
+++ b/drivers/infiniband/sw/rxe/rxe_pool.c
@@ -244,6 +244,8 @@ int __rxe_get(struct rxe_pool_elem *elem)
 
 int __rxe_put(struct rxe_pool_elem *elem)
 {
+	if (WARN_ON(kref_read(&elem->ref_cnt) <= 0))
+		return 0;
 	return kref_put(&elem->ref_cnt, rxe_elem_release);
 }
 
-- 
2.37.2


  parent reply	other threads:[~2023-03-04 17:46 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-03-04 17:45 [PATCH for-next v3 0/8] RDMA/rxe: Correct qp reference counting Bob Pearson
2023-03-04 17:45 ` [PATCH for-next v3 1/8] RDMA/rxe: Convert tasklet args to queue pairs Bob Pearson
2023-03-04 17:45 ` Bob Pearson [this message]
2023-03-24 14:18   ` [PATCH for-next v3 2/8] RDMA/rxe: Warn if refcnt zero in rxe_put Jason Gunthorpe
2023-03-04 17:45 ` [PATCH for-next v3 3/8] RDMA/rxe: Cleanup reset state handling in rxe_resp.c Bob Pearson
2023-03-04 17:45 ` [PATCH for-next v3 4/8] RDMA/rxe: Cleanup error state handling in rxe_comp.c Bob Pearson
2023-03-04 17:45 ` [PATCH for-next v3 5/8] RDMA/rxe: Remove qp reference counting in tasks Bob Pearson
2023-03-04 17:45 ` [PATCH for-next v3 6/8] RDMA/rxe: Remove __rxe_do_task() Bob Pearson
2023-03-04 17:45 ` [PATCH for-next v3 7/8] RDMA/rxe: Make tasks schedule each other Bob Pearson
2023-03-04 17:45 ` [PATCH for-next v3 8/8] RDMA/rxe: Rewrite rxe_task.c Bob Pearson
2023-03-24 14:23 ` [PATCH for-next v3 0/8] RDMA/rxe: Correct qp reference counting Jason Gunthorpe

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