[SCSI] mpt2sas: Fix for staged device discovery functionality of driver not working
This patch provides a command line option to disable "Port enable" during
the driver load.
The objective of this command line option is to load the driver and do
all the necessary initialization excluding port enable(i.e. delay
device discovery)
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@lsi.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
diff --git a/drivers/scsi/mpt2sas/mpt2sas_scsih.c b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
index ab3d9d3..66c7736 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_scsih.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
@@ -119,6 +119,10 @@
MODULE_PARM_DESC(diag_buffer_enable, " post diag buffers "
"(TRACE=1/SNAPSHOT=2/EXTENDED=4/default=0)");
+static int disable_discovery = -1;
+module_param(disable_discovery, int, 0);
+MODULE_PARM_DESC(disable_discovery, " disable discovery ");
+
/**
* struct sense_info - common structure for obtaining sense keys
* @skey: sense key
@@ -5973,8 +5977,14 @@
#endif
if (event_data->ReasonCode == MPI2_EVENT_SAS_DISC_RC_STARTED &&
- !ioc->sas_hba.num_phys)
+ !ioc->sas_hba.num_phys) {
+ if (disable_discovery > 0 && ioc->shost_recovery) {
+ /* Wait for the reset to complete */
+ while (ioc->shost_recovery)
+ ssleep(1);
+ }
_scsih_sas_host_add(ioc);
+ }
}
/**
@@ -7929,6 +7939,9 @@
if (diag_buffer_enable != -1 && diag_buffer_enable != 0)
mpt2sas_enable_diag_buffer(ioc, diag_buffer_enable);
+ if (disable_discovery > 0)
+ return;
+
ioc->start_scan = 1;
rc = mpt2sas_port_enable(ioc);
@@ -7950,6 +7963,12 @@
{
struct MPT2SAS_ADAPTER *ioc = shost_priv(shost);
+ if (disable_discovery > 0) {
+ ioc->is_driver_loading = 0;
+ ioc->wait_for_discovery_to_complete = 0;
+ return 1;
+ }
+
if (time >= (300 * HZ)) {
ioc->base_cmds.status = MPT2_CMD_NOT_USED;
printk(MPT2SAS_INFO_FMT "port enable: FAILED with timeout "