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Date: Mon, 24 Oct 2022 11:26:37 +0800 From: Li Zhijian <lizhijian@...itsu.com> To: zyjzyj2000@...il.com, jgg@...pe.ca, leon@...nel.org, linux-rdma@...r.kernel.org Cc: linux-kernel@...r.kernel.org Subject: Re: [for-next PATCH v2 1/2] RDMA/rxe: Remove unnecessary mr testing Just noticed i didn't post [2/2] successfully, will sent it in next version. On 21/10/2022 15:52, Li Zhijian wrote: > Before the testing, we already passed it to rxe_mr_copy() where mr could > be dereferenced. so this checking is not exactly correct. > > I tried to figure out the details how/when mr could be NULL, but failed > at last. Add a WARN_ON(!mr) to that path to tell us more when it > happends. > > Signed-off-by: Li Zhijian <lizhijian@...itsu.com> > --- > drivers/infiniband/sw/rxe/rxe_resp.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/infiniband/sw/rxe/rxe_resp.c b/drivers/infiniband/sw/rxe/rxe_resp.c > index ed5a09e86417..218c14fb07c6 100644 > --- a/drivers/infiniband/sw/rxe/rxe_resp.c > +++ b/drivers/infiniband/sw/rxe/rxe_resp.c > @@ -778,6 +778,7 @@ static enum resp_states read_reply(struct rxe_qp *qp, > if (res->state == rdatm_res_state_new) { > if (!res->replay) { > mr = qp->resp.mr; > + WARN_ON(!mr); > qp->resp.mr = NULL; > } else { > mr = rxe_recheck_mr(qp, res->read.rkey); > @@ -811,8 +812,7 @@ static enum resp_states read_reply(struct rxe_qp *qp, > > rxe_mr_copy(mr, res->read.va, payload_addr(&ack_pkt), > payload, RXE_FROM_MR_OBJ); > - if (mr) > - rxe_put(mr); > + rxe_put(mr); > > if (bth_pad(&ack_pkt)) { > u8 *pad = payload_addr(&ack_pkt) + payload;
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