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authorKashyap, Desai <kashyap.desai@lsi.com>2010-03-30 10:52:44 +0530
committerJames Bottomley <James.Bottomley@suse.de>2010-04-11 13:27:01 -0500
commit1469585309bb52869cbaa449c6d2cd1ce9869cca (patch)
tree111af0cfae42fbaa9bacb07327c185c1eb9ad0f9 /drivers/scsi/mpt2sas
parentf87146bba523cad0196aa8e80ca9e8243d7a6c0c (diff)
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[SCSI] mpt2sas : IOs needs to be pause until handles are refreshed for all device after recovery
After Host Reset firmware will have new list of device handles for the target. Device handle refresh in driver is part of Rescan topology logic. (See functions like *_search_responding_*). This needs to be done from Host Reset context before making shost_recovery to 0. Currently it is done in Firwmare event context, which may leads IO to a wrong device. Now handler refresh is moved to HBA reset context. Apart from this, Now driver will stop IOs for all device setting deleted flag to 1 at the time of HBA Reset through _scsih_prep_device_scan. It will only unblock devices, if devices has been found as part of RESCAN. This way it will make more safe IO blocking at the time of HBA reset at mpt2sas driver layer. Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'drivers/scsi/mpt2sas')
-rw-r--r--drivers/scsi/mpt2sas/mpt2sas_scsih.c49
1 files changed, 40 insertions, 9 deletions
diff --git a/drivers/scsi/mpt2sas/mpt2sas_scsih.c b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
index b0d598e..1f0466a 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_scsih.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
@@ -5506,6 +5506,26 @@ _scsih_task_set_full(struct MPT2SAS_ADAPTER *ioc, struct fw_event_work
}
/**
+ * _scsih_prep_device_scan - initialize parameters prior to device scan
+ * @ioc: per adapter object
+ *
+ * Set the deleted flag prior to device scan. If the device is found during
+ * the scan, then we clear the deleted flag.
+ */
+static void
+_scsih_prep_device_scan(struct MPT2SAS_ADAPTER *ioc)
+{
+ struct MPT2SAS_DEVICE *sas_device_priv_data;
+ struct scsi_device *sdev;
+
+ shost_for_each_device(sdev, ioc->shost) {
+ sas_device_priv_data = sdev->hostdata;
+ if (sas_device_priv_data && sas_device_priv_data->sas_target)
+ sas_device_priv_data->sas_target->deleted = 1;
+ }
+}
+
+/**
* _scsih_mark_responding_sas_device - mark a sas_devices as responding
* @ioc: per adapter object
* @sas_address: sas address
@@ -5532,8 +5552,12 @@ _scsih_mark_responding_sas_device(struct MPT2SAS_ADAPTER *ioc, u64 sas_address,
sas_device->slot == slot && sas_device->starget) {
sas_device->responding = 1;
starget = sas_device->starget;
- sas_target_priv_data = starget->hostdata;
- sas_target_priv_data->tm_busy = 0;
+ if (starget && starget->hostdata) {
+ sas_target_priv_data = starget->hostdata;
+ sas_target_priv_data->tm_busy = 0;
+ sas_target_priv_data->deleted = 0;
+ } else
+ sas_target_priv_data = NULL;
starget_printk(KERN_INFO, sas_device->starget,
"handle(0x%04x), sas_addr(0x%016llx), enclosure "
"logical id(0x%016llx), slot(%d)\n", handle,
@@ -5546,7 +5570,8 @@ _scsih_mark_responding_sas_device(struct MPT2SAS_ADAPTER *ioc, u64 sas_address,
printk(KERN_INFO "\thandle changed from(0x%04x)!!!\n",
sas_device->handle);
sas_device->handle = handle;
- sas_target_priv_data->handle = handle;
+ if (sas_target_priv_data)
+ sas_target_priv_data->handle = handle;
goto out;
}
}
@@ -5621,6 +5646,12 @@ _scsih_mark_responding_raid_device(struct MPT2SAS_ADAPTER *ioc, u64 wwid,
spin_lock_irqsave(&ioc->raid_device_lock, flags);
list_for_each_entry(raid_device, &ioc->raid_device_list, list) {
if (raid_device->wwid == wwid && raid_device->starget) {
+ starget = raid_device->starget;
+ if (starget && starget->hostdata) {
+ sas_target_priv_data = starget->hostdata;
+ sas_target_priv_data->deleted = 0;
+ } else
+ sas_target_priv_data = NULL;
raid_device->responding = 1;
starget_printk(KERN_INFO, raid_device->starget,
"handle(0x%04x), wwid(0x%016llx)\n", handle,
@@ -5630,9 +5661,8 @@ _scsih_mark_responding_raid_device(struct MPT2SAS_ADAPTER *ioc, u64 wwid,
printk(KERN_INFO "\thandle changed from(0x%04x)!!!\n",
raid_device->handle);
raid_device->handle = handle;
- starget = raid_device->starget;
- sas_target_priv_data = starget->hostdata;
- sas_target_priv_data->handle = handle;
+ if (sas_target_priv_data)
+ sas_target_priv_data->handle = handle;
goto out;
}
}
@@ -5857,6 +5887,10 @@ mpt2sas_scsih_reset_handler(struct MPT2SAS_ADAPTER *ioc, int reset_phase)
dtmprintk(ioc, printk(MPT2SAS_DEBUG_FMT "%s: "
"MPT2_IOC_DONE_RESET\n", ioc->name, __func__));
_scsih_sas_host_refresh(ioc);
+ _scsih_prep_device_scan(ioc);
+ _scsih_search_responding_sas_devices(ioc);
+ _scsih_search_responding_raid_devices(ioc);
+ _scsih_search_responding_expanders(ioc);
break;
}
}
@@ -5894,9 +5928,6 @@ _firmware_event_work(struct work_struct *work)
} else
spin_unlock_irqrestore(&ioc->ioc_reset_in_progress_lock,
flags);
- _scsih_search_responding_sas_devices(ioc);
- _scsih_search_responding_raid_devices(ioc);
- _scsih_search_responding_expanders(ioc);
_scsih_remove_unresponding_sas_devices(ioc);
return;
}