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| author | kib <kib@FreeBSD.org> | 2008-06-05 09:15:47 +0000 |
|---|---|---|
| committer | kib <kib@FreeBSD.org> | 2008-06-05 09:15:47 +0000 |
| commit | 99633165a5f86fa9bb63d51c824f99c1f7eb258b (patch) | |
| tree | 94d1017a62657b6bb29511fe9683164833071c01 /sys/fs/devfs | |
| parent | 570605957cddbe81ec5fa4432db2f18cc42f934a (diff) | |
| download | FreeBSD-src-99633165a5f86fa9bb63d51c824f99c1f7eb258b.zip FreeBSD-src-99633165a5f86fa9bb63d51c824f99c1f7eb258b.tar.gz | |
When devfs_allocv() committed to create new vnode, since de_vnode is NULL,
the dm_lock is held while the newly allocated vnode is locked. Since no
other threads may try to lock the new vnode yet, the LOR there cannot
result in the deadlock.
Shut down the witness warning to note this fact.
Tested by: pho
Prodded by: attilio
Diffstat (limited to 'sys/fs/devfs')
| -rw-r--r-- | sys/fs/devfs/devfs_vnops.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/sys/fs/devfs/devfs_vnops.c b/sys/fs/devfs/devfs_vnops.c index 813f3a5..649f492d 100644 --- a/sys/fs/devfs/devfs_vnops.c +++ b/sys/fs/devfs/devfs_vnops.c @@ -340,7 +340,7 @@ devfs_allocv(struct devfs_dirent *de, struct mount *mp, struct vnode **vpp, stru } else { vp->v_type = VBAD; } - vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); + vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_NOWITNESS); mtx_lock(&devfs_de_interlock); vp->v_data = de; de->de_vnode = vp; |
