sgi-gru: fix bugs related to module unload of the GRU driver

Fix bugs related to module unload of the GRU driver.
Signed-off-by: NJack Steiner <steiner@sgi.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/misc/sgi-gru/grufile.c

@@ -440,7 +440,7 @@ static int __init gru_init(void)
 
 static void __exit gru_exit(void)
 {
-	int i, bid;
+	int i, bid, gid;
 	int order = get_order(sizeof(struct gru_state) *
 			      GRU_CHIPLETS_PER_BLADE);
 
@@ -450,6 +450,9 @@ static void __exit gru_exit(void)
 	for (i = 0; i < GRU_CHIPLETS_PER_BLADE; i++)
 		free_irq(IRQ_GRU + i, NULL);
 
+	foreach_gid(gid)
+		gru_kservices_exit(GID_TO_GRU(gid));
+
 	for (bid = 0; bid < GRU_MAX_BLADES; bid++)
 		free_pages((unsigned long)gru_base[bid], order);
 

drivers/misc/sgi-gru/grukservices.c

@@ -690,3 +690,22 @@ int gru_kservices_init(struct gru_state *gru)
 		quicktest(gru);
 	return 0;
 }
+
+void gru_kservices_exit(struct gru_state *gru)
+{
+	struct gru_context_configuration_handle *cch;
+	struct gru_blade_state *bs;
+
+	bs = gru->gs_blade;
+	if (gru != &bs->bs_grus[1])
+		return;
+
+	cch = get_cch(gru->gs_gru_base_vaddr, KERNEL_CTXNUM);
+	lock_cch_handle(cch);
+	if (cch_interrupt_sync(cch))
+		BUG();
+	if (cch_deallocate(cch))
+		BUG();
+	unlock_cch_handle(cch);
+}
+

drivers/misc/sgi-gru/grutables.h

@@ -600,6 +600,7 @@ extern void gru_unload_context(struct gru_thread_state *gts, int savestate);
 extern void gts_drop(struct gru_thread_state *gts);
 extern void gru_tgh_flush_init(struct gru_state *gru);
 extern int gru_kservices_init(struct gru_state *gru);
+extern void gru_kservices_exit(struct gru_state *gru);
 extern irqreturn_t gru_intr(int irq, void *dev_id);
 extern int gru_handle_user_call_os(unsigned long address);
 extern int gru_user_flush_tlb(unsigned long arg);