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MFC: Lock the vnode interlock while reading v_usecount to update

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si_usecount in a cdev in devfs_reclaim().
This commit is contained in:
jhb 2008-01-12 00:17:50 +00:00
parent 2eab57b4d5
commit 35e8ffa483
1 changed files with 3 additions and 0 deletions
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3
sys/fs/devfs/devfs_vnops.c
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@ -987,17 +987,20 @@ devfs_reclaim(struct vop_reclaim_args *ap)
vnode_destroy_vobject(vp); vnode_destroy_vobject(vp);
VI_LOCK(vp);
dev_lock(); dev_lock();
dev = vp->v_rdev; dev = vp->v_rdev;
vp->v_rdev = NULL; vp->v_rdev = NULL;
if (dev == NULL) { if (dev == NULL) {
dev_unlock(); dev_unlock();
VI_UNLOCK(vp);
return (0); return (0);
} }
dev->si_usecount -= vp->v_usecount; dev->si_usecount -= vp->v_usecount;
dev_unlock(); dev_unlock();
VI_UNLOCK(vp);
dev_rel(dev); dev_rel(dev);
return (0); return (0);
} }