[src/trunk]: src/sys/external/bsd/drm2/linux linux: Use IPL_VM for lock insid...

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

details:   https://anonhg.NetBSD.org/src/rev/3b192e349e04
branches:  trunk
changeset: 1028575:3b192e349e04
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Sun Dec 19 11:21:38 2021 +0000

description:
linux: Use IPL_VM for lock inside rw_semaphore.

down_read_trylock needs to work under a spin lock.

diffstat:

 sys/external/bsd/drm2/linux/linux_rwsem.c |  6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diffs (27 lines):

diff -r 97c6e9a4c647 -r 3b192e349e04 sys/external/bsd/drm2/linux/linux_rwsem.c
--- a/sys/external/bsd/drm2/linux/linux_rwsem.c Sun Dec 19 11:21:30 2021 +0000
+++ b/sys/external/bsd/drm2/linux/linux_rwsem.c Sun Dec 19 11:21:38 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: linux_rwsem.c,v 1.1 2021/12/19 11:21:30 riastradh Exp $        */
+/*     $NetBSD: linux_rwsem.c,v 1.2 2021/12/19 11:21:38 riastradh Exp $        */
 
 /*-
  * Copyright (c) 2021 The NetBSD Foundation, Inc.
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: linux_rwsem.c,v 1.1 2021/12/19 11:21:30 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: linux_rwsem.c,v 1.2 2021/12/19 11:21:38 riastradh Exp $");
 
 #include <sys/types.h>
 
@@ -45,7 +45,7 @@
 init_rwsem(struct rw_semaphore *rwsem)
 {
 
-       mutex_init(&rwsem->rws_lock, MUTEX_DEFAULT, IPL_NONE);
+       mutex_init(&rwsem->rws_lock, MUTEX_DEFAULT, IPL_VM);
        cv_init(&rwsem->rws_cv, "lnxrwsem");
        rwsem->rws_writer = NULL;
        rwsem->rws_readers = 0;