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specfs(9): XXX comment: what if read downgrades lock?

This commit is contained in:
riastradh 2022-09-21 10:59:10 +00:00
parent a8266b77ca
commit ae1d5f78a6
1 changed files with 4 additions and 3 deletions
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7
sys/miscfs/specfs/spec_vnops.c
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@ -1,4 +1,4 @@
/* $NetBSD: spec_vnops.c,v 1.214 2022/08/12 21:25:39 riastradh Exp $ */
/* $NetBSD: spec_vnops.c,v 1.215 2022/09/21 10:59:10 riastradh Exp $ */
/*-
* Copyright (c) 2008 The NetBSD Foundation, Inc.
@ -58,7 +58,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: spec_vnops.c,v 1.214 2022/08/12 21:25:39 riastradh Exp $");
__KERNEL_RCSID(0, "$NetBSD: spec_vnops.c,v 1.215 2022/09/21 10:59:10 riastradh Exp $");
#include <sys/param.h>
#include <sys/proc.h>
@ -1100,7 +1100,8 @@ spec_read(void *v)
goto out;
error = cdev_read(dev, uio, ap->a_ioflag);
spec_io_exit(vp, sn);
out: vn_lock(vp, LK_SHARED | LK_RETRY);
out: /* XXX What if the caller held an exclusive lock? */
vn_lock(vp, LK_SHARED | LK_RETRY);
return (error);
case VBLK: