4.14-stable review patch. If anyone has any objections, please let me know.
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[ Upstream commit 09dd15e0d9547ca424de4043bcd429bab6f285c8 ]
Following an RSCN, ibmvfc will issue an ADISC to determine if the underlying target has changed, comparing the SCSI ID, WWPN, and WWNN to determine how to handle the rport in discovery. However, the comparison of the WWPN and WWNN was performing a memcmp between a big endian field against a CPU endian field, which resulted in the wrong answer on LE systems. This was observed as unexpected errors getting logged at boot time as targets were getting relogins when not needed.
Signed-off-by: Brian King brking@linux.vnet.ibm.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/scsi/ibmvscsi/ibmvfc.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c index b491af31a5f8..a06b24a61622 100644 --- a/drivers/scsi/ibmvscsi/ibmvfc.c +++ b/drivers/scsi/ibmvscsi/ibmvfc.c @@ -3580,11 +3580,9 @@ static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt) static int ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad *mad, struct ibmvfc_target *tgt) { - if (memcmp(&mad->fc_iu.response[2], &tgt->ids.port_name, - sizeof(tgt->ids.port_name))) + if (wwn_to_u64((u8 *)&mad->fc_iu.response[2]) != tgt->ids.port_name) return 1; - if (memcmp(&mad->fc_iu.response[4], &tgt->ids.node_name, - sizeof(tgt->ids.node_name))) + if (wwn_to_u64((u8 *)&mad->fc_iu.response[4]) != tgt->ids.node_name) return 1; if (be32_to_cpu(mad->fc_iu.response[6]) != tgt->scsi_id) return 1;