svn commit: r256015 - stable/9/sys/kern

[Konstantin Belousov]

Author: kib
Date: Thu Oct  3 06:14:44 2013
New Revision: 256015
URL: http://svnweb.freebsd.org/changeset/base/256015

Log:
  MFC r255880:
  Acquire a hold reference on the vnode when a knote is instantiated.

Modified:
  stable/9/sys/kern/vfs_subr.c
Directory Properties:
  stable/9/sys/   (props changed)

Modified: stable/9/sys/kern/vfs_subr.c
==============================================================================
--- stable/9/sys/kern/vfs_subr.c	Thu Oct  3 01:53:17 2013	(r256014)
+++ stable/9/sys/kern/vfs_subr.c	Thu Oct  3 06:14:44 2013	(r256015)
@@ -4525,6 +4525,7 @@ vfs_kqfilter(struct vop_kqfilter_args *a
 	if (vp->v_pollinfo == NULL)
 		return (ENOMEM);
 	knl = &vp->v_pollinfo->vpi_selinfo.si_note;
+	vhold(vp);
 	knlist_add(knl, kn, 0);
 
 	return (0);
@@ -4540,6 +4541,7 @@ filt_vfsdetach(struct knote *kn)
 
 	KASSERT(vp->v_pollinfo != NULL, ("Missing v_pollinfo"));
 	knlist_remove(&vp->v_pollinfo->vpi_selinfo.si_note, kn, 0);
+	vdrop(vp);
 }
 
 /*ARGSUSED*/