[SCSI] mpt2sas: Delete volume before HBA detach.

The driver hangs when doing `rmmod mpt2sas` if there are any
IR volumes present.The hang is due the scsi midlayer trying to access the
IR volumes after the driver releases controller resources.  Perhaps when
scsi_remove_host is called,the scsi mid layer is sending some request.
This doesn't occur for bare drives becuase the driver is already reporting
those drives deleted prior to calling mpt2sas_base_detach.
To solve this issue, we need to delete the volumes as well.

Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com>
Reviewed-by: Eric Moore <eric.moore@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

diff --git a/drivers/scsi/mpt2sas/mpt2sas_scsih.c b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
index efabea1..cd55176 100644 (file)
--- a/drivers/scsi/mpt2sas/mpt2sas_scsih.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
@@ -5998,6 +5998,8 @@ _scsih_remove(struct pci_dev *pdev)
        struct _sas_port *mpt2sas_port;
        struct _sas_device *sas_device;
        struct _sas_node *expander_sibling;
+       struct _raid_device *raid_device, *next;
+       struct MPT2SAS_TARGET *sas_target_priv_data;
        struct workqueue_struct *wq;
        unsigned long flags;
 
@@ -6011,6 +6013,21 @@ _scsih_remove(struct pci_dev *pdev)
        if (wq)
                destroy_workqueue(wq);
 
+       /* release all the volumes */
+       list_for_each_entry_safe(raid_device, next, &ioc->raid_device_list,
+           list) {
+               if (raid_device->starget) {
+                       sas_target_priv_data =
+                           raid_device->starget->hostdata;
+                       sas_target_priv_data->deleted = 1;
+                       scsi_remove_target(&raid_device->starget->dev);
+               }
+               printk(MPT2SAS_INFO_FMT "removing handle(0x%04x), wwid"
+                   "(0x%016llx)\n", ioc->name,  raid_device->handle,
+                   (unsigned long long) raid_device->wwid);
+               _scsih_raid_device_remove(ioc, raid_device);
+       }
+
        /* free ports attached to the sas_host */
  retry_again:
        list_for_each_entry(mpt2sas_port,