From: Jason Gunthorpe Date: Thu, 4 Jun 2026 01:27:40 +0000 (-0300) Subject: IB/mlx5: Don't take the rereg_mr fallback without a new translation X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=55d339d200c908de83a408d023cfb7be779b0dd7;p=thirdparty%2Flinux.git IB/mlx5: Don't take the rereg_mr fallback without a new translation Jumping to mlx5_ib_reg_user_mr() without IB_MR_REREG_TRANS set will use garbage values for start, length, and iova. Recovering the original mr parameters for ODP and DMABUF to properly recreate it is too hard in this flow, so just fail it. Fixes: ef3642c4f54d ("RDMA/mlx5: Fix error unwinds for rereg_mr") Link: https://patch.msgid.link/r/1-v1-29ebd2c229b5+fd5-ib_mr_pd_jgg@nvidia.com Signed-off-by: Jason Gunthorpe --- diff --git a/drivers/infiniband/hw/mlx5/mr.c b/drivers/infiniband/hw/mlx5/mr.c index 254e6aa4ccafb..0fa0a57240c01 100644 --- a/drivers/infiniband/hw/mlx5/mr.c +++ b/drivers/infiniband/hw/mlx5/mr.c @@ -1198,7 +1198,7 @@ struct ib_mr *mlx5_ib_rereg_user_mr(struct ib_mr *ib_mr, int flags, u64 start, } /* DM or ODP MR's don't have a normal umem so we can't re-use it */ if (!mr->umem || is_odp_mr(mr) || is_dmabuf_mr(mr)) - goto recreate; + return ERR_PTR(-EOPNOTSUPP); /* * Only one active MR can refer to a umem at one time, revoke