[src/trunk]: src/sys/arch/arm/pic Add reference counts to intr_mask/intr_unma...

[jmcneill <jmcneill%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/fbdf65c297b8
branches:  trunk
changeset: 847462:fbdf65c297b8
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Mon Dec 23 15:51:47 2019 +0000

description:
Add reference counts to intr_mask/intr_unmask as calls can be nested, spotted by thorpej

diffstat:

 sys/arch/arm/pic/pic.c    |  10 ++++++----
 sys/arch/arm/pic/picvar.h |   3 ++-
 2 files changed, 8 insertions(+), 5 deletions(-)

diffs (55 lines):

diff -r a64f8380d214 -r fbdf65c297b8 sys/arch/arm/pic/pic.c
--- a/sys/arch/arm/pic/pic.c    Mon Dec 23 15:48:51 2019 +0000
+++ b/sys/arch/arm/pic/pic.c    Mon Dec 23 15:51:47 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: pic.c,v 1.49 2019/12/23 15:34:23 jmcneill Exp $        */
+/*     $NetBSD: pic.c,v 1.50 2019/12/23 15:51:47 jmcneill Exp $        */
 /*-
  * Copyright (c) 2008 The NetBSD Foundation, Inc.
  * All rights reserved.
@@ -33,7 +33,7 @@
 #include "opt_multiprocessor.h"
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: pic.c,v 1.49 2019/12/23 15:34:23 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pic.c,v 1.50 2019/12/23 15:51:47 jmcneill Exp $");
 
 #include <sys/param.h>
 #include <sys/atomic.h>
@@ -909,7 +909,8 @@
        struct pic_softc * const pic = is->is_pic;
        const int irq = is->is_irq;
 
-       (*pic->pic_ops->pic_block_irqs)(pic, irq & ~0x1f, __BIT(irq & 0x1f));
+       if (atomic_inc_32_nv(&is->is_mask_count) == 1)
+               (*pic->pic_ops->pic_block_irqs)(pic, irq & ~0x1f, __BIT(irq & 0x1f));
 }
 
 void
@@ -919,7 +920,8 @@
        struct pic_softc * const pic = is->is_pic;
        const int irq = is->is_irq;
 
-       (*pic->pic_ops->pic_unblock_irqs)(pic, irq & ~0x1f, __BIT(irq & 0x1f));
+       if (atomic_dec_32_nv(&is->is_mask_count) == 0)
+               (*pic->pic_ops->pic_unblock_irqs)(pic, irq & ~0x1f, __BIT(irq & 0x1f));
 }
 
 const char *
diff -r a64f8380d214 -r fbdf65c297b8 sys/arch/arm/pic/picvar.h
--- a/sys/arch/arm/pic/picvar.h Mon Dec 23 15:48:51 2019 +0000
+++ b/sys/arch/arm/pic/picvar.h Mon Dec 23 15:51:47 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: picvar.h,v 1.24 2019/12/23 15:34:23 jmcneill Exp $     */
+/*     $NetBSD: picvar.h,v 1.25 2019/12/23 15:51:47 jmcneill Exp $     */
 /*-
  * Copyright (c) 2008 The NetBSD Foundation, Inc.
  * All rights reserved.
@@ -126,6 +126,7 @@
        bool is_mpsafe;
        char is_source[16];
        char *is_xname;
+       uint32_t is_mask_count;
 };
 
 struct pic_percpu {