Re: [PATCH] kernfs: Drop kernfs_rwsem while invoking lookup_positive_unlocked().

[Sebastian Andrzej Siewior]

On 2025-02-20 20:39:24 [+0000], Al Viro wrote:
> On Tue, Feb 18, 2025 at 05:39:38PM +0100, Sebastian Andrzej Siewior wrote:
> 
> > +	scoped_guard(rcu) {
> > +		knparent = find_next_ancestor(kn, NULL);
> > +		if (WARN_ON(!knparent)) {
> > +			dput(dentry);
> > +			return ERR_PTR(-EINVAL);
> > +		}
> 
> NAK.  dput() is blocking; you *can't* do that under rcu_read_lock().

Thank you.
Since it got merged, let me do another one on top.

Sebastian