linux-kernel - Re: [PATCH v3 1/3] drm/v3d: Add support for V3D v4.2.

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Date:   Fri, 8 Mar 2019 16:38:08 +0000
From:   Dave Emett <david.emett@...adcom.com>
To:     Eric Anholt <eric@...olt.net>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Thomas Spurden <thomas.spurden@...adcom.com>
Subject: Re: [PATCH v3 1/3] drm/v3d: Add support for V3D v4.2.

Sorry, a few things I thought of after sending the Reviewed-by email...

> +       v3d->reset = devm_reset_control_get_exclusive(dev, NULL);
> +       if (IS_ERR(v3d->reset)) {
> +               ret = PTR_ERR(v3d->reset);
> +
> +               if (ret == -EPROBE_DEFER)
> +                       goto dev_free;
Might be preferable to make this explicitly check against the
not-found error code (whatever that is)? As in if (not found)
<fallback to bridge> else <return error code>. Similarly...

> +       if (platform_get_irq(v3d->pdev, 1) < 0) {
This should probably explicitly check for not-found rather than any
error. As-is, we might silently go down the single-interrupt-line path
on a platform with 2 interrupt lines if platform_get_irq(v3d->pdev, 1)
hits some other error.

> +               ret = devm_request_irq(v3d->dev, platform_get_irq(v3d->pdev, 0),
> +                                      v3d_hub_irq, IRQF_SHARED,
> +                                      "v3d_hub", v3d);
> +               ret = devm_request_irq(v3d->dev, platform_get_irq(v3d->pdev, 1),
> +                                      v3d_irq, IRQF_SHARED,
> +                                      "v3d_core0", v3d);
Not introduced by this change, but return value from first
devm_request_irq ignored here?