| Message ID | 20230724200843.3376570-3-bvanassche@acm.org |
|---|---|
| State | New |
| Headers | show |
| Series | Fix residual handling in two SCSI LLDs | expand |
On Mon, Jul 24, 2023 at 01:08:30PM -0700, Bart Van Assche wrote: > Although the code for residual handling in the SRP initiator follows the > SCSI documentation, that documentation has never been correct. Because > scsi_finish_command() starts from the data buffer length and subtracts > the residual, scsi_set_resid() must not be called if a residual overflow > occurs. Hence remove the scsi_set_resid() calls from the SRP initiator > if a residual overflow occurrs. > > Cc: Leon Romanovsky <leon@kernel.org> > Cc: Jason Gunthorpe <jgg@nvidia.com> > Fixes: 9237f04e12cc ("scsi: core: Fix scsi_get/set_resid() interface") > Fixes: e714531a349f ("IB/srp: Fix residual handling") > Signed-off-by: Bart Van Assche <bvanassche@acm.org> > --- > drivers/infiniband/ulp/srp/ib_srp.c | 4 ---- > 1 file changed, 4 deletions(-) > Thanks, Acked-by: Leon Romanovsky <leon@kernel.org>
diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c index 0e513a7e5ac8..1574218764e0 100644 --- a/drivers/infiniband/ulp/srp/ib_srp.c +++ b/drivers/infiniband/ulp/srp/ib_srp.c @@ -1979,12 +1979,8 @@ static void srp_process_rsp(struct srp_rdma_ch *ch, struct srp_rsp *rsp) if (unlikely(rsp->flags & SRP_RSP_FLAG_DIUNDER)) scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt)); - else if (unlikely(rsp->flags & SRP_RSP_FLAG_DIOVER)) - scsi_set_resid(scmnd, -be32_to_cpu(rsp->data_in_res_cnt)); else if (unlikely(rsp->flags & SRP_RSP_FLAG_DOUNDER)) scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt)); - else if (unlikely(rsp->flags & SRP_RSP_FLAG_DOOVER)) - scsi_set_resid(scmnd, -be32_to_cpu(rsp->data_out_res_cnt)); srp_free_req(ch, req, scmnd, be32_to_cpu(rsp->req_lim_delta));
Although the code for residual handling in the SRP initiator follows the SCSI documentation, that documentation has never been correct. Because scsi_finish_command() starts from the data buffer length and subtracts the residual, scsi_set_resid() must not be called if a residual overflow occurs. Hence remove the scsi_set_resid() calls from the SRP initiator if a residual overflow occurrs. Cc: Leon Romanovsky <leon@kernel.org> Cc: Jason Gunthorpe <jgg@nvidia.com> Fixes: 9237f04e12cc ("scsi: core: Fix scsi_get/set_resid() interface") Fixes: e714531a349f ("IB/srp: Fix residual handling") Signed-off-by: Bart Van Assche <bvanassche@acm.org> --- drivers/infiniband/ulp/srp/ib_srp.c | 4 ---- 1 file changed, 4 deletions(-)