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: Jack Steiner <steiner@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 24 insertions, 1 deletions

diff --git a/drivers/misc/sgi-gru/grufile.c b/drivers/misc/sgi-gru/grufile.c
index b7a21ce91496..3e6e42d2f01b 100644
--- a/drivers/misc/sgi-gru/grufile.c
+++ b/drivers/misc/sgi-gru/grufile.c
@@ -440,7 +440,7 @@ exit1:
 
 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);
 
diff --git a/drivers/misc/sgi-gru/grukservices.c b/drivers/misc/sgi-gru/grukservices.c
index a37128431155..6b1efe447274 100644
--- a/drivers/misc/sgi-gru/grukservices.c
+++ b/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);
+}
+
diff --git a/drivers/misc/sgi-gru/grutables.h b/drivers/misc/sgi-gru/grutables.h
index c6e0e3de07f3..8e5c8e5bb533 100644
--- a/drivers/misc/sgi-gru/grutables.h
+++ b/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);