hpsa: fix rmmod issues
The driver is calling hpsa_shutdown before calling scsi_remove_host.
hpsa_shutdown is disabling interrupts.
scsi_remove_host can trigger I/O operations, such as
SYNCHRONIZE CACHE when multipath is enabled which hang the system.
Call scsi_remove_host before calling hpsa_shutdown.
Reviewed-by: Kevin Barnett <kevin.barnett@pmcs.com>
Reviewed-by: Scott Teel <scott.teel@pmcs.com>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: Don Brace <don.brace@pmcs.com>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index 3f1c2a8..40669f8 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -8272,6 +8272,14 @@
destroy_workqueue(h->rescan_ctlr_wq);
destroy_workqueue(h->resubmit_wq);
+ /*
+ * Call before disabling interrupts.
+ * scsi_remove_host can trigger I/O operations especially
+ * when multipath is enabled. There can be SYNCHRONIZE CACHE
+ * operations which cannot complete and will hang the system.
+ */
+ if (h->scsi_host)
+ scsi_remove_host(h->scsi_host); /* init_one 8 */
/* includes hpsa_free_irqs - init_one 4 */
/* includes hpsa_disable_interrupt_mode - pci_init 2 */
hpsa_shutdown(pdev);
@@ -8280,8 +8288,6 @@
kfree(h->hba_inquiry_data); /* init_one 10 */
h->hba_inquiry_data = NULL; /* init_one 10 */
- if (h->scsi_host)
- scsi_remove_host(h->scsi_host); /* init_one 8 */
hpsa_free_ioaccel2_sg_chain_blocks(h);
hpsa_free_performant_mode(h); /* init_one 7 */
hpsa_free_sg_chain_blocks(h); /* init_one 6 */