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PCATCH in tsleep while waiting for operations in getop. Otherwise 

we could end up in an unkillable deadlock if GETOP was called when
an operation that had locked the root vnode was already in userspace.
This commit is contained in:
pooka 2006-12-10 22:37:04 +00:00
parent fcdf5459d0
commit 5d1ddd3277
1 changed files with 8 additions and 5 deletions
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13
sys/fs/puffs/puffs_msgif.c
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@ -1,4 +1,4 @@
/* $NetBSD: puffs_msgif.c,v 1.10 2006/12/05 23:41:24 pooka Exp $ */
/* $NetBSD: puffs_msgif.c,v 1.11 2006/12/10 22:37:04 pooka Exp $ */
/*
* Copyright (c) 2005, 2006 Antti Kantee. All Rights Reserved.
@ -33,7 +33,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: puffs_msgif.c,v 1.10 2006/12/05 23:41:24 pooka Exp $");
__KERNEL_RCSID(0, "$NetBSD: puffs_msgif.c,v 1.11 2006/12/10 22:37:04 pooka Exp $");
#include <sys/param.h>
#include <sys/malloc.h>
@ -287,9 +287,12 @@ puffs_getop(struct puffs_mount *pmp, struct puffs_reqh_get *phg, int nonblock)
goto out;
}
ltsleep(&pmp->pmp_req_touser, PUSER, "puffs2", 0,
&pmp->pmp_lock);
goto again;
error = ltsleep(&pmp->pmp_req_touser, PUSER | PCATCH,
"puffs2", 0, &pmp->pmp_lock);
if (error)
goto out;
else
goto again;
}
park = TAILQ_FIRST(&pmp->pmp_req_touser);