linux-kernel - Re: [RFC PATCH 1/2] serial: sh-sci: start hrtimer after setting up DMA

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Date: Wed, 24 Apr 2024 11:41:03 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Wolfram Sang <wsa+renesas@...g-engineering.com>
Cc: linux-renesas-soc@...r.kernel.org, Dirk Behme <dirk.behme@...bosch.com>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Jiri Slaby <jirislaby@...nel.org>, 
	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: [RFC PATCH 1/2] serial: sh-sci: start hrtimer after setting up DMA

Hi Wolfram,

Thanks for your patch!

On Tue, Apr 16, 2024 at 2:35 PM Wolfram Sang
<wsa+renesas@...g-engineering.com> wrote:
> In the RX DMA completion handler, the hrtimer was restarted before DMA
> was set up. If DMA failed, for some reason, it would clean up and the
> hrtimer would run into a NULL-pointer. Restart the timer after DMA was

.. into a NULL-pointer dereference of s->chan_rx.

> successfully set up.
>
> Reported-by: Dirk Behme <dirk.behme@...bosch.com>
> Closes: https://lore.kernel.org/r/ee6c9e16-9f29-450e-81da-4a8dceaa8fc7@debosch.com
> Fixes: 67f462b069e9 ("serial: sh-sci: Get rid of the workqueue to handle receive DMA requests")
> Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>

This is definitely a step in the right direction, so
Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68korg

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds