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RDMA/mlx5: Fix potential race between destroy and CQE poll 

[ Upstream commit 4b916ed9f9e85f705213ca8d69771d3c1cd6ee5a ]

The SRQ can be destroyed right before mlx5_cmd_get_srq is called.
In such case the latter will return NULL instead of expected SRQ.

Fixes: e126ba97db ("mlx5: Add driver for Mellanox Connect-IB adapters")
Link: https://lore.kernel.org/r/20200830084010.102381-5-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Leon Romanovsky 2020-08-30 11:40:04 +03:00 committed by Greg Kroah-Hartman
parent 935950e319
commit b8d4f65c6a
1 changed files with 3 additions and 2 deletions
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5
drivers/infiniband/hw/mlx5/cq.c
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@ -167,7 +167,7 @@ static void handle_responder(struct ib_wc *wc, struct mlx5_cqe64 *cqe,
{
enum rdma_link_layer ll = rdma_port_get_link_layer(qp->ibqp.device, 1);
struct mlx5_ib_dev *dev = to_mdev(qp->ibqp.device);
struct mlx5_ib_srq *srq;
struct mlx5_ib_srq *srq = NULL;
struct mlx5_ib_wq *wq;
u16 wqe_ctr;
u8 roce_packet_type;
@ -179,7 +179,8 @@ static void handle_responder(struct ib_wc *wc, struct mlx5_cqe64 *cqe,
if (qp->ibqp.xrcd) {
msrq = mlx5_cmd_get_srq(dev, be32_to_cpu(cqe->srqn));
srq = to_mibsrq(msrq);
if (msrq)
srq = to_mibsrq(msrq);
} else {
srq = to_msrq(qp->ibqp.srq);
}