path: root/drivers/s390
diff options
authorBenjamin Block <bblock@linux.ibm.com>2020-05-08 19:23:31 +0200
committerMartin K. Petersen <martin.petersen@oracle.com>2020-05-11 23:19:48 -0400
commit990486f3a8508494dab2a7ff0fcc3eb977557d89 (patch)
treeb7ad5d4fc1abdd8e6a5a8d964da188994f9a8a1e /drivers/s390
parent52e61fde5ec95cb4011784fb0bc6b436e16fcaa8 (diff)
scsi: zfcp: Fence fc_host updates during link-down handling
When receiving a notification that a FCP device lost its local link we usually update the fibre channel host object which represents that FCP device to reflect that. This notification/information can also surface when the FCP device is running through adapter recovery (exchange config and exchange port data return incomplete). When moving the scsi host object allocation and registration - and thus also the fibre channel host object allocation - to after the first exchange config and exchange port data, and this happens during the very first adapter recovery, these updates can not be done until after the scsi host object is allocated. Reorder the fc_host updates in zfcp_fsf_fc_host_link_down() so that they only happen after a check of whether the scsi host object is already allocated or not. During the first adapter recovery this will cause the skip of these updates if a link-down condition is detected, but we can repeat them after we allocated the scsi host object, if necessary. For any further link-down handling the only changes in the work flow are the slightly reordered assignments in zfcp_fsf_fc_host_link_down(). Link: https://lore.kernel.org/r/f841f2cda61dcd7b8549910c44e1831927459edf.1588956679.git.bblock@linux.ibm.com Reviewed-by: Steffen Maier <maier@linux.ibm.com> Signed-off-by: Benjamin Block <bblock@linux.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/s390')
1 files changed, 9 insertions, 5 deletions
diff --git a/drivers/s390/scsi/zfcp_fsf.c b/drivers/s390/scsi/zfcp_fsf.c
index bfb567a1d7bf..8c4b690e329e 100644
--- a/drivers/s390/scsi/zfcp_fsf.c
+++ b/drivers/s390/scsi/zfcp_fsf.c
@@ -124,17 +124,21 @@ static void zfcp_fsf_fc_host_link_down(struct zfcp_adapter *adapter)
struct Scsi_Host *shost = adapter->scsi_host;
+ adapter->hydra_version = 0;
+ adapter->peer_wwpn = 0;
+ adapter->peer_wwnn = 0;
+ adapter->peer_d_id = 0;
+ /* if there is no shost yet, we have nothing to zero-out */
+ if (shost == NULL)
+ return;
fc_host_port_id(shost) = 0;
fc_host_fabric_name(shost) = 0;
fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
fc_host_port_type(shost) = FC_PORTTYPE_UNKNOWN;
- adapter->hydra_version = 0;
snprintf(fc_host_model(shost), FC_SYMBOLIC_NAME_SIZE, "0x%04x", 0);
memset(fc_host_active_fc4s(shost), 0, FC_FC4_LIST_SIZE);
- adapter->peer_wwpn = 0;
- adapter->peer_wwnn = 0;
- adapter->peer_d_id = 0;
static void zfcp_fsf_link_down_info_eval(struct zfcp_fsf_req *req,

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