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[SCSI] mpt2sas : IOs needs to be pause until handles are refreshed for all device after recovery

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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>
This commit is contained in:
Kashyap, Desai 2010-03-30 10:52:44 +05:30 committed by James Bottomley
parent f87146bba5
commit 1469585309
1 changed files with 40 additions and 9 deletions
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49
drivers/scsi/mpt2sas/mpt2sas_scsih.c
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@ -5505,6 +5505,26 @@ _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
@ -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;
}