mpt2sas: staged device discovery. disable_discovery module parameter is added.

PATCH New Kashyap, Desai 1 participant 1 message Jun 17, 2010 SCSI

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Kashyap, Desai

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2010-06-17 08:36 UTC #0 lore raw

PATCH 3/17 mpt2sas: staged device discovery. disable_discovery module parameter is added.

Added command line option called disable_discovery. When enabled on the command line, the driver will not send a port_enable when loaded
for the first time. If port_enable is not called, then there is
no discovery of devices, as well as the sas topology. Then later if one desires to invoke discovery, then they will need to issue a diagnostic reset. A diagnostic reset can be issued various ways. One of the way is throught sysfs.

Signed-off-by Kashyap Desai <[email protected]>

---

drivers/scsi/mpt2sas/mpt2sas_base.c +7 -0

index 62ea5a6..d978c8a 100644
@@ -95,6 +95,10 @@ int mpt2sas_fwfault_debug;
 MODULE_PARM_DESC(mpt2sas_fwfault_debug, " enable detection of firmware fault "
     "and halt firmware - (default=0)");
 
+static int disable_discovery = -1;
+module_param(disable_discovery, int, 0);
+MODULE_PARM_DESC(disable_discovery, " disable discovery ");
+
 /**
  * _scsih_set_fwfault_debug - global setting of ioc->fwfault_debug.
  *

@@ -3520,6 +3524,9 @@ _base_make_ioc_operational(struct MPT2SAS_ADAPTER *ioc, int sleep_flag)
 	if (sleep_flag == CAN_SLEEP)
 		_base_static_config_pages(ioc);
 
+	if (ioc->wait_for_port_enable_to_complete && disable_discovery > 0)
+		return r;
+
 	r = _base_send_port_enable(ioc, sleep_flag);
 	if (r)
 		return r;

drivers/scsi/mpt2sas/mpt2sas_base.h +0 -0