linux-kernel - Re: [PATCH v3 3/3] phy: amlogic: meson8b-usb2: fix shared reset control use

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Date:   Sun, 21 Nov 2021 00:57:09 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     Amjad Ouled-Ameur <aouledameur@...libre.com>
Cc:     khilman@...libre.com, p.zabel@...gutronix.de, balbi@...nel.org,
        jbrunet@...libre.com, linux-amlogic@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH v3 3/3] phy: amlogic: meson8b-usb2: fix shared reset
 control use

Hi Amjad,

Thanks for working on this!

On Fri, Nov 12, 2021 at 5:33 PM Amjad Ouled-Ameur
<aouledameur@...libre.com> wrote:
[...]
> +               reset_control_rearm(priv->reset);
Using priv->reset in this driver currently requires an IS_ERR check beforehand.
When I wrote the driver originally I used the following code in
phy_meson8b_usb2_probe:
  priv->reset = ...
  if (PTR_ERR(priv->reset) == -EPROBE_DEFER)
    return PTR_ERR(priv->reset);

That means: priv->reset can (in theory) be an error pointer at runtime.
Since your patch is valid: can you please add another one (before this
one) in the series and change the priv->reset error checking to use
something like:
  if (IS_ERR(priv->reset))
    return dev_err_probe(&pdev->dev, PTR_ERR(priv->reset), "Failed to
get the reset line");

With such a patch you can consider this one as:
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>


Best regards,
Martin