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scsi: ibmvfc: Avoid unnecessary port relogin 

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>
This commit is contained in:
Brian King 2018-03-14 17:13:39 -05:00 committed by Martin K. Petersen
parent c3506df850
commit 09dd15e0d9
1 changed files with 2 additions and 4 deletions
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6
drivers/scsi/ibmvscsi/ibmvfc.c
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@ -3579,11 +3579,9 @@ static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt)
static int ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad *mad, static int ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad *mad,
struct ibmvfc_target *tgt) struct ibmvfc_target *tgt)
{ {
if (memcmp(&mad->fc_iu.response[2], &tgt->ids.port_name, if (wwn_to_u64((u8 *)&mad->fc_iu.response[2]) != tgt->ids.port_name)
sizeof(tgt->ids.port_name)))
return 1; return 1;
if (memcmp(&mad->fc_iu.response[4], &tgt->ids.node_name, if (wwn_to_u64((u8 *)&mad->fc_iu.response[4]) != tgt->ids.node_name)
sizeof(tgt->ids.node_name)))
return 1; return 1;
if (be32_to_cpu(mad->fc_iu.response[6]) != tgt->scsi_id) if (be32_to_cpu(mad->fc_iu.response[6]) != tgt->scsi_id)
return 1; return 1;