svn commit: r201021 - in head/sys: dev/hwpmc sys

[Kostik Belousov]

> +		freepath = NULL;
> +		pmc_getfilename(vp, &fullpath, &freepath);
> +		last_vp = vp;
> +		vrele(vp);
> +		vp = NULL;

You should do VFS_LOCK_GIANT/VFS_UNLOCK_GIANT around vrele(), since
vrele() may need to acquire vnode lock and inactivate the vnode.
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