D23529.id67845.diff
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D23529.id67845.diff
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	Index: sys/kern/vfs_subr.c
	===================================================================
	--- sys/kern/vfs_subr.c
	+++ sys/kern/vfs_subr.c
	@@ -3192,12 +3192,22 @@
	* count which provides liveness of the vnode, in which case we
	* have to vdrop.
	*/
	- if (!refcount_release(&vp->v_usecount)) {
	- if (func == VPUTX_VPUT)
	- VOP_UNLOCK(vp);
	- return;
	+ if (__predict_false(vp->v_type == VCHR && func == VPUTX_VRELE)) {
	+ if (refcount_release_if_not_last(&vp->v_usecount))
	+ return;
	+ VI_LOCK(vp);
	+ if (!refcount_release(&vp->v_usecount)) {
	+ VI_UNLOCK(vp);
	+ return;
	+ }
	+ } else {
	+ if (!refcount_release(&vp->v_usecount)) {
	+ if (func == VPUTX_VPUT)
	+ VOP_UNLOCK(vp);
	+ return;
	+ }
	+ VI_LOCK(vp);
	}
	- VI_LOCK(vp);
	v_decr_devcount(vp);
	/*
	* By the time we got here someone else might have transitioned