From 4b193175364ac2c31999f0e571df02a6b9315c8c Mon Sep 17 00:00:00 2001 From: "sreekanth.reddy@lsi.com" Date: Tue, 17 Jul 2012 15:56:12 +0530 Subject: [PATCH] [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 Signed-off-by: James Bottomley --- drivers/scsi/mpt2sas/mpt2sas_scsih.c | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/mpt2sas/mpt2sas_scsih.c b/drivers/scsi/mpt2sas/mpt2sas_scsih.c index ab3d9d3e805f..66c773662694 100644 --- a/drivers/scsi/mpt2sas/mpt2sas_scsih.c +++ b/drivers/scsi/mpt2sas/mpt2sas_scsih.c @@ -119,6 +119,10 @@ module_param(diag_buffer_enable, int, 0); 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 @@ _scsih_sas_discovery_event(struct MPT2SAS_ADAPTER *ioc, #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 @@ _scsih_scan_start(struct Scsi_Host *shost) 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 @@ _scsih_scan_finished(struct Scsi_Host *shost, unsigned long time) { 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 " -- 2.34.1