linux-kernel - Re: [PATCH v8] ath9k: let sleep be interrupted when unregistering hwrng

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Date:   Thu, 30 Jun 2022 18:17:03 -0700
From:   Gregory Erwin <gregerwin256@...il.com>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        Kalle Valo <kvalo@...nel.org>,
        Rui Salvaterra <rsalvaterra@...il.com>, stable@...r.kernel.org
Subject: Re: [PATCH v8] ath9k: let sleep be interrupted when unregistering hwrng

On Thu, Jun 30, 2022 at 7:03 AM Jason A. Donenfeld <Jason@...c4.com> wrote:
>
> Hey Gregory,
>
> On Wed, Jun 29, 2022 at 01:42:40PM +0200, Jason A. Donenfeld wrote:
> > There are two deadlock scenarios that need addressing, which cause
> > problems when the computer goes to sleep, the interface is set down, and
> > hwrng_unregister() is called. When the deadlock is hit, sleep is delayed
> > for tens of seconds, causing it to fail. These scenarios are:
> >
> > 1) The hwrng kthread can't be stopped while it's sleeping, because it
> >    uses msleep_interruptible() instead of schedule_timeout_interruptible().
> >    The fix is a simple moving to the correct function. At the same time,
> >    we should cleanup a common and useless dmesg splat in the same area.
> >
> > 2) A normal user thread can't be interrupted by hwrng_unregister() while
> >    it's sleeping, because hwrng_unregister() is called from elsewhere.
> >    The solution here is to keep track of which thread is currently
> >    reading, and asleep, and signal that thread when it's time to
> >    unregister. There's a bit of book keeping required to prevent
> >    lifetime issues on current.
> >
> > Reported-by: Gregory Erwin <gregerwin256@...il.com>
> > Cc: Toke Høiland-Jørgensen <toke@...hat.com>
> > Cc: Kalle Valo <kvalo@...nel.org>
> > Cc: Rui Salvaterra <rsalvaterra@...il.com>
> > Cc: Herbert Xu <herbert@...dor.apana.org.au>
> > Cc: stable@...r.kernel.org
> > Fixes: fcd09c90c3c5 ("ath9k: use hw_random API instead of directly dumping into random.c")
> > Link: https://lore.kernel.org/all/CAO+Okf6ZJC5-nTE_EJUGQtd8JiCkiEHytGgDsFGTEjs0c00giw@mail.gmail.com/
> > Link: https://lore.kernel.org/lkml/CAO+Okf5k+C+SE6pMVfPf-d8MfVPVq4PO7EY8Hys_DVXtent3HA@mail.gmail.com/
> > Link: https://bugs.archlinux.org/task/75138
> > Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
>
> Hoping for your `Tested-by:` if this still works for you.
>
> Jason

Apologies for the delay.
Tested-by: Gregory Erwin <gregerwin256@...il.com>