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authorArun Easi <arun.easi@qlogic.com>2011-05-10 11:18:16 -0700
committerJames Bottomley <jbottomley@parallels.com>2011-05-17 11:29:10 +0400
commit43ebf16d762b082663976b679b813e1b546548d1 (patch)
tree322a7baa171c3c15782d13705ed0347a18553c62 /drivers/scsi
parentfa96d927362a422405d65491326f8ef763572e84 (diff)
[SCSI] qla2xxx: Fix hang during driver unload when vport is active.
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>
Diffstat (limited to 'drivers/scsi')
-rw-r--r--drivers/scsi/qla2xxx/qla_os.c25
1 files changed, 15 insertions, 10 deletions
diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index 7168e7f2443..010f560ab99 100644
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -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);
+
+ fc_vport_terminate(vha->fc_vport);
+ scsi_host_put(vha->host);
- atomic_dec(&vha->vref_count);
+ mutex_lock(&ha->vport_lock);
}
- spin_unlock_irqrestore(&ha->vport_slock, flags);
+ mutex_unlock(&ha->vport_lock);
set_bit(UNLOADING, &base_vha->dpc_flags);