scsi: hpsa: destroy sas transport properties before scsi_host

This patch cleans up a lot of warnings when unloading the driver.

A current example of the stack trace starts with:
    [  142.570715] sysfs group 'power' not found for kobject 'port-5:0'
There can be hundreds of these messages during a driver unload.

I am resubmitting this patch on behalf of Martin Wilck with his
permission.

His original patch can be found here:
https://www.spinics.net/lists/linux-scsi/msg102085.html

This patch did not help until Hannes's
commit 9441284fbc39 ("scsi-fixup-kernel-warning-during-rmmod")
was applied to the kernel.

---------------------------
Original patch description:
---------------------------

Unloading the hpsa driver causes warnings

[ 1063.793652] WARNING: CPU: 1 PID: 4850 at ../fs/sysfs/group.c:237 device_del+0x54/0x240()
[ 1063.793659] sysfs group ffffffff81cf21a0 not found for kobject 'port-2:0'

with two different stacks:
1)
[ 1063.793774]  [<ffffffff81448af4>] device_del+0x54/0x240
[ 1063.793780]  [<ffffffff8145178a>] transport_remove_classdev+0x4a/0x60
[ 1063.793784]  [<ffffffff81451216>] attribute_container_device_trigger+0xa6/0xb0
[ 1063.793802]  [<ffffffffa0105d46>] sas_port_delete+0x126/0x160 [scsi_transport_sas]
[ 1063.793819]  [<ffffffffa036ebcc>] hpsa_free_sas_port+0x3c/0x70 [hpsa]

2)
[ 1063.797103]  [<ffffffff81448af4>] device_del+0x54/0x240
[ 1063.797118]  [<ffffffffa0105d4e>] sas_port_delete+0x12e/0x160 [scsi_transport_sas]
[ 1063.797134]  [<ffffffffa036ebcc>] hpsa_free_sas_port+0x3c/0x70 [hpsa]

This is caused by the fact that host device hostX is deleted before the
SAS transport devices hostX/port-a:b.

This patch fixes this by reverting the order of device deletions.

Tested-by: Don Brace <don.brace@microsemi.com>
Reviewed-by: Don Brace <don.brace@microsemi.com>
Signed-off-by: Martin Wilck <mwilck@suse.de>
Signed-off-by: Don Brace <don.brace@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index 9abe810..aff4a4f 100644 (file)
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -8684,6 +8684,8 @@ static void hpsa_remove_one(struct pci_dev *pdev)
        destroy_workqueue(h->rescan_ctlr_wq);
        destroy_workqueue(h->resubmit_wq);
 
+       hpsa_delete_sas_host(h);
+
        /*
         * Call before disabling interrupts.
         * scsi_remove_host can trigger I/O operations especially
@@ -8718,8 +8720,6 @@ static void hpsa_remove_one(struct pci_dev *pdev)
        h->lockup_detected = NULL;                      /* init_one 2 */
        /* (void) pci_disable_pcie_error_reporting(pdev); */    /* init_one 1 */
 
-       hpsa_delete_sas_host(h);
-
        kfree(h);                                       /* init_one 1 */
 }