From 7acf570ce51a5ebee55ef72e77916afdb4a351a7 Mon Sep 17 00:00:00 2001 From: Stephen Cameron Date: Fri, 23 Jan 2015 16:43:14 -0600 Subject: [PATCH] hpsa: do not request device rescan on every ioaccel path error The original reasoning behind doing this was faulty. An error of some sort would be encountered, accelerated i/o would be disabled for that logical drive, the command would be kicked back out to the SCSI midlayer for a retry, and since i/o accelerator mode was disabled, it would get retried down the RAID path. However, something needs to turn ioaccellerator mode back on, and this rescan request was what did that. However, it was racy, and extremely bad for performance to rescan all devices, so, don't do that. Reviewed-by: Scott Teel Signed-off-by: Don Brace Signed-off-by: Christoph Hellwig --- drivers/scsi/hpsa.c | 14 ++------------ drivers/scsi/hpsa.h | 1 - 2 files changed, 2 insertions(+), 13 deletions(-) diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c index 70f07af6119b..94a82e367bf1 100644 --- a/drivers/scsi/hpsa.c +++ b/drivers/scsi/hpsa.c @@ -1637,21 +1637,19 @@ static void process_ioaccel2_completion(struct ctlr_info *h, c2->error_data.serv_response == IOACCEL2_SERV_RESPONSE_FAILURE) { dev->offload_enabled = 0; - h->drv_req_rescan = 1; /* schedule controller for a rescan */ cmd->result = DID_SOFT_ERROR << 16; cmd_free(h, c); cmd->scsi_done(cmd); return; } raid_retry = handle_ioaccel_mode2_error(h, c, cmd, c2); - /* If error found, disable Smart Path, schedule a rescan, - * and force a retry on the standard path. + /* If error found, disable Smart Path, + * force a retry on the standard path. */ if (raid_retry) { dev_warn(&h->pdev->dev, "%s: Retrying on standard path.\n", "HP SSD Smart Path"); dev->offload_enabled = 0; /* Disable Smart Path */ - h->drv_req_rescan = 1; /* schedule controller rescan */ cmd->result = DID_SOFT_ERROR << 16; } cmd_free(h, c); @@ -6478,9 +6476,6 @@ static void hpsa_ack_ctlr_events(struct ctlr_info *h) int i; char *event_type; - /* Clear the driver-requested rescan flag */ - h->drv_req_rescan = 0; - /* Ask the controller to clear the events we're handling. */ if ((h->transMethod & (CFGTBL_Trans_io_accel1 | CFGTBL_Trans_io_accel2)) && @@ -6526,9 +6521,6 @@ static void hpsa_ack_ctlr_events(struct ctlr_info *h) */ static int hpsa_ctlr_needs_rescan(struct ctlr_info *h) { - if (h->drv_req_rescan) - return 1; - if (!(h->fw_support & MISC_FW_EVENT_NOTIFY)) return 0; @@ -6574,7 +6566,6 @@ static void hpsa_monitor_ctlr_worker(struct work_struct *work) if (hpsa_ctlr_needs_rescan(h) || hpsa_offline_devices_ready(h)) { scsi_host_get(h->scsi_host); - h->drv_req_rescan = 0; hpsa_ack_ctlr_events(h); hpsa_scan_start(h->scsi_host); scsi_host_put(h->scsi_host); @@ -6743,7 +6734,6 @@ reinit_after_soft_reset: /* Enable Accelerated IO path at driver layer */ h->acciopath_status = 1; - h->drv_req_rescan = 0; /* Turn the interrupts on so we can service requests */ h->access.set_intr_mask(h, HPSA_INTR_ON); diff --git a/drivers/scsi/hpsa.h b/drivers/scsi/hpsa.h index e7d7eaa864d1..06a3e812ec38 100644 --- a/drivers/scsi/hpsa.h +++ b/drivers/scsi/hpsa.h @@ -235,7 +235,6 @@ struct ctlr_info { spinlock_t offline_device_lock; struct list_head offline_device_list; int acciopath_status; - int drv_req_rescan; /* flag for driver to request rescan event */ int raid_offload_debug; }; -- 2.39.5