[SCSI] aacraid: Better handling of in-flight events on thread stop

When an error occured that would shut down the driver, some in-flight
events were getting caught up, deadlocking a CPU or two.
Signed-off-by: Ben Collins <bcollins@ubuntu.com>
Acked-by: Achim Leubner <Achim_Leubner@pmc-sierra.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

drivers/scsi/aacraid/linit.c

@@ -1089,8 +1089,17 @@ static struct scsi_host_template aac_driver_template = {
 
 static void __aac_shutdown(struct aac_dev * aac)
 {
-	if (aac->aif_thread)
+	if (aac->aif_thread) {
+		int i;
+		/* Clear out events first */
+		for (i = 0; i < (aac->scsi_host_ptr->can_queue + AAC_NUM_MGT_FIB); i++) {
+			struct fib *fib = &aac->fibs[i];
+			if (!(fib->hw_fib_va->header.XferState & cpu_to_le32(NoResponseExpected | Async)) &&
+			    (fib->hw_fib_va->header.XferState & cpu_to_le32(ResponseExpected)))
+				up(&fib->event_wait);
+		}
 		kthread_stop(aac->thread);
+	}
 	aac_send_shutdown(aac);
 	aac_adapter_disable_int(aac);
 	free_irq(aac->pdev->irq, aac);
@@ -1191,6 +1200,7 @@ static int __devinit aac_probe_one(struct pci_dev *pdev,
 	if (IS_ERR(aac->thread)) {
 		printk(KERN_ERR "aacraid: Unable to create command thread.\n");
 		error = PTR_ERR(aac->thread);
+		aac->thread = NULL;
 		goto out_deinit;
 	}