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[SCSI] qla2xxx: Fix hang during driver unload when vport is active.

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Bumping ref count during fc_vport_terminate() was the cause. vport
delete would wait for ref count to drop to zero and that would never
happen.

Cc: stable@kernel.org
Signed-off-by: Arun Easi <arun.easi@qlogic.com>
Signed-off-by: Madhuranath Iyengar <Madhu.Iyengar@qlogic.com>
Signed-off-by: James Bottomley <jbottomley@parallels.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Arun Easi 2011-05-10 11:18:16 -07:00 committed by James Bottomley
parent fa96d92736
commit 43ebf16d76
1 changed files with 15 additions and 10 deletions
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25
drivers/scsi/qla2xxx/qla_os.c
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@ -2368,21 +2368,26 @@ qla2x00_remove_one(struct pci_dev *pdev)
base_vha = pci_get_drvdata(pdev);
ha = base_vha->hw;
spin_lock_irqsave(&ha->vport_slock, flags);
list_for_each_entry(vha, &ha->vp_list, list) {
atomic_inc(&vha->vref_count);
mutex_lock(&ha->vport_lock);
while (ha->cur_vport_count) {
struct Scsi_Host *scsi_host;
if (vha->fc_vport) {
spin_unlock_irqrestore(&ha->vport_slock, flags);
spin_lock_irqsave(&ha->vport_slock, flags);
fc_vport_terminate(vha->fc_vport);
BUG_ON(base_vha->list.next == &ha->vp_list);
/* This assumes first entry in ha->vp_list is always base vha */
vha = list_first_entry(&base_vha->list, scsi_qla_host_t, list);
scsi_host = scsi_host_get(vha->host);
spin_lock_irqsave(&ha->vport_slock, flags);
}
spin_unlock_irqrestore(&ha->vport_slock, flags);
mutex_unlock(&ha->vport_lock);
atomic_dec(&vha->vref_count);
fc_vport_terminate(vha->fc_vport);
scsi_host_put(vha->host);
mutex_lock(&ha->vport_lock);
}
spin_unlock_irqrestore(&ha->vport_slock, flags);
mutex_unlock(&ha->vport_lock);
set_bit(UNLOADING, &base_vha->dpc_flags);