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[SCSI] mpt2sas: Fix for system hang when discovery in progress 

Fix for issue : While discovery is in progress, hot unplug and hot plug of
enclosure connected to the controller card is causing system to hang.

When a device is in the process of being detected at driver load time then
if it is removed, the device that is no longer present will not be added
to the list. So the code in _scsih_probe_sas() is rearranged as such so
the devices that failed to be detected are not added to the list.

Signed-off-by: Nagalakshmi Nandigama <nagalakshmi.nandigama@lsi.com>
Cc: stable@kernel.org
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
nagalakshmi.nandigama@lsi.com 2011-10-21 10:06:33 +05:30 committed by James Bottomley
parent 921cd8024b
commit 0167ac67ff
1 changed files with 10 additions and 5 deletions
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15
drivers/scsi/mpt2sas/mpt2sas_scsih.c
View File

@ -7657,22 +7657,27 @@ _scsih_probe_sas(struct MPT2SAS_ADAPTER *ioc)
/* SAS Device List */
list_for_each_entry_safe(sas_device, next, &ioc->sas_device_init_list,
list) {
spin_lock_irqsave(&ioc->sas_device_lock, flags);
list_move_tail(&sas_device->list, &ioc->sas_device_list);
spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
if (ioc->hide_drives)
continue;
if (!mpt2sas_transport_port_add(ioc, sas_device->handle,
sas_device->sas_address_parent)) {
_scsih_sas_device_remove(ioc, sas_device);
list_del(&sas_device->list);
kfree(sas_device);
continue;
} else if (!sas_device->starget) {
mpt2sas_transport_port_remove(ioc,
sas_device->sas_address,
sas_device->sas_address_parent);
_scsih_sas_device_remove(ioc, sas_device);
list_del(&sas_device->list);
kfree(sas_device);
continue;
}
spin_lock_irqsave(&ioc->sas_device_lock, flags);
list_move_tail(&sas_device->list, &ioc->sas_device_list);
spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
}
}