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Message-ID: <CAMuHMdVvARk6i_aU6B7yPFfAGwaK5Yh=idYP9iuEAHoP9PvjOg@mail.gmail.com>
Date: Wed, 17 Apr 2024 16:38:14 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Prabhakar <prabhakar.csengg@...il.com>
Cc: Philipp Zabel <p.zabel@...gutronix.de>, Biju Das <biju.das.jz@...renesas.com>,
linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH] reset: reset-rzg2l-usbphy-ctrl: Ensure reset line is
asserted in error path
Hi Prabhakar,
On Thu, Mar 21, 2024 at 12:43 PM Prabhakar <prabhakar.csengg@...il.com> wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
>
> In the event of failure during devm_reset_controller_register(), ensure
> that the reset line is asserted back.
>
> Fixes: bee08559701fb ("reset: renesas: Add RZ/G2L usbphy control driver")
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Thanks for your patch!
> --- a/drivers/reset/reset-rzg2l-usbphy-ctrl.c
> +++ b/drivers/reset/reset-rzg2l-usbphy-ctrl.c
> @@ -132,8 +132,10 @@ static int rzg2l_usbphy_ctrl_probe(struct platform_device *pdev)
> priv->rcdev.dev = dev;
>
> error = devm_reset_controller_register(dev, &priv->rcdev);
> - if (error)
> + if (error) {
> + reset_control_assert(priv->rstc);
> return error;
> + }
>
> spin_lock_init(&priv->lock);
> dev_set_drvdata(dev, priv);
Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
Alternatively, you could register a cleanup handler with
devm_add_action_or_reset(), like many drivers already do.
Or better, turn devm_aspeed_peci_reset_control_deassert() into a
generic helper, and convert all drivers[1] to use that.
That would just leave us with undoing pm_runtime_enable(), which can
be automated using devm_pm_runtime_enable() instead.
[1] git grep -w devm.*reset_control_assert
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
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