linux-kernel - Re: [PATCH] clk: fix possible circular locking in clk_notifier

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Message-ID: <162335989440.9598.5831025849742947247@swboyd.mtv.corp.google.com>
Date:   Thu, 10 Jun 2021 14:18:14 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Michael Turquette <mturquette@...libre.com>,
        Sean Nyekjaer <sean@...nix.com>
Cc:     linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: fix possible circular locking in clk_notifier_register()

Quoting Sean Nyekjaer (2021-06-10 00:23:30)
> On 10/06/2021 09.17, Sean Nyekjaer wrote:
> > Allocating memory with prepare_lock mutex held makes lockdep unhappy
> > when memory pressure makes the system do fs_reclaim on eg. rawnand using
> > clk.
> > 
> > Push the allocation outside the lock.
> > 
> [...]
> > 
> > Signed-off-by: Sean Nyekjaer <sean@...nix.com>
> Fixes: b2476490ef111 ("clk: introduce the common clock framework")
> 
> We could possibly add this fixes tag ^^

Sure.