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authorJames Smart <james.smart@emulex.com>2015-04-07 21:07:13 +0200
committerJames Bottomley <JBottomley@Odin.com>2015-04-10 16:46:35 +0200
commitea4142f6b10585f271a40ee52eec2f55e48aeccf (patch)
tree553816bdcdf18b3c887c3d10fc3933b2a0d3c937 /drivers/scsi/lpfc/lpfc_scsi.c
parentlpfc: Linux lpfc driver doesn't re-establish the link after a cable pull on L... (diff)
downloadlinux-ea4142f6b10585f271a40ee52eec2f55e48aeccf.tar.xz
linux-ea4142f6b10585f271a40ee52eec2f55e48aeccf.zip
lpfc: Fix host reset escalation killing all IOs.
Fix host reset escalation killing all IOs. SLI-3 adapters will use a new host template. The template differs from SLI-4 adapters in that it does not have an eh_host_reset_handler. Lpfc has traditionally never had a host_reset. The host reset handler was added when we ran into a stuck hardware condition on a SLI-4 adapter. The host_reset will reset and reinit the pci function, clearing the hardware condition. Unfortunately, the host reset handler uses attach/detach code paths, which makes scsi_add_host() and scsi_remove_host() calls. Meaning, a host_reset will completely remove the scsi_host from the system. As a new call to scsi_add_host() is made, the shost# changes, which results in completely new scsi_devices and device names. All the older scsi devices on the old shost# are now orphaned and unrecoverable. We realize we need to re-implement the host_reset_handler so the scsi_host stays registered across the host_reset, but that will be a rather lengthy effort. In the short term, we had an immediate need to restore the SLI-3 devices to their working behavior, with the easiest path being to remove their host_reset handler. Signed-off-by: Dick Kennedy <dick.kennedy@emulex.com> Signed-off-by: James Smart <james.smart@emulex.com> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: James Bottomley <JBottomley@Odin.com>
Diffstat (limited to 'drivers/scsi/lpfc/lpfc_scsi.c')
-rw-r--r--drivers/scsi/lpfc/lpfc_scsi.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c
index 4f9222eb2266..f6232991fb37 100644
--- a/drivers/scsi/lpfc/lpfc_scsi.c
+++ b/drivers/scsi/lpfc/lpfc_scsi.c
@@ -5857,6 +5857,31 @@ lpfc_disable_oas_lun(struct lpfc_hba *phba, struct lpfc_name *vport_wwpn,
return false;
}
+struct scsi_host_template lpfc_template_s3 = {
+ .module = THIS_MODULE,
+ .name = LPFC_DRIVER_NAME,
+ .info = lpfc_info,
+ .queuecommand = lpfc_queuecommand,
+ .eh_abort_handler = lpfc_abort_handler,
+ .eh_device_reset_handler = lpfc_device_reset_handler,
+ .eh_target_reset_handler = lpfc_target_reset_handler,
+ .eh_bus_reset_handler = lpfc_bus_reset_handler,
+ .slave_alloc = lpfc_slave_alloc,
+ .slave_configure = lpfc_slave_configure,
+ .slave_destroy = lpfc_slave_destroy,
+ .scan_finished = lpfc_scan_finished,
+ .this_id = -1,
+ .sg_tablesize = LPFC_DEFAULT_SG_SEG_CNT,
+ .cmd_per_lun = LPFC_CMD_PER_LUN,
+ .use_clustering = ENABLE_CLUSTERING,
+ .shost_attrs = lpfc_hba_attrs,
+ .max_sectors = 0xFFFF,
+ .vendor_id = LPFC_NL_VENDOR_ID,
+ .change_queue_depth = scsi_change_queue_depth,
+ .use_blk_tags = 1,
+ .track_queue_depth = 1,
+};
+
struct scsi_host_template lpfc_template = {
.module = THIS_MODULE,
.name = LPFC_DRIVER_NAME,