[SCSI] mpt2sas: RESCAN Barrier work is added in case of HBA reset.

Add the cancel_pending_work flag from the fw_event_work structure, and then to
set the flag during host reset, check the flag later from work threads
context and if cancel_pending_work_flag is set ingore those events.

Now Rescan after host reset is changed.
Added special task MPT2SAS_RESCAN_AFTER_HOST_RESET. This task will be queued
at the time of HBA reset. this task is treated as barrier. All work after
MPT2SAS_RESCAN_AFTER_HOST_RESET will be treated as new work and will be
server by callback handle. If host_recovery is going on while running RESCAN
task, it will wait for shos_recovery_done completion which will be called
from HBA reset DONE context.

Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com>
Reviewed-by: Eric Moore <eric.moore@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 1 insertions, 2 deletions

diff --git a/drivers/scsi/mpt2sas/mpt2sas_base.h b/drivers/scsi/mpt2sas/mpt2sas_base.h
index e18b0544c38f..a5ec09f7c90a 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_base.h
+++ b/drivers/scsi/mpt2sas/mpt2sas_base.h
@@ -119,7 +119,6 @@
 #define MPT2_IOC_PRE_RESET              1 /* prior to host reset */
 #define MPT2_IOC_AFTER_RESET            2 /* just after host reset */
 #define MPT2_IOC_DONE_RESET             3 /* links re-initialized */
-#define MPT2_IOC_RUNNING                4 /* shost running */
 
 /*
  * logging format
@@ -603,7 +602,6 @@ struct MPT2SAS_ADAPTER {
         /* fw event handler */
         char            firmware_event_name[20];
         struct workqueue_struct *firmware_event_thread;
-        u8              fw_events_off;
         spinlock_t      fw_event_lock;
         struct list_head fw_event_list;
 
@@ -611,6 +609,7 @@ struct MPT2SAS_ADAPTER {
         int             aen_event_read_flag;
         u8              broadcast_aen_busy;
         u8              shost_recovery;
+        struct completion       shost_recovery_done;
         spinlock_t      ioc_reset_in_progress_lock;
         u8              ioc_link_reset_in_progress;
         u8              ignore_loginfos;