linux-kernel - Re: [PATCH v2] ide/macide: Convert Mac IDE driver to platform driver

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Date:   Thu, 24 Sep 2020 13:29:21 +1200
From:   Michael Schmitz <schmitzmic@...il.com>
To:     Finn Thain <fthain@...egraphics.com.au>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Joshua Thompson <funaho@...ai.org>,
        linux-m68k@...ts.linux-m68k.org, linux-kernel@...r.kernel.org,
        linux-ide@...r.kernel.org
Subject: Re: [PATCH v2] ide/macide: Convert Mac IDE driver to platform driver

Hi Finn,

On 24/09/20 1:07 PM, Finn Thain wrote:
> Looking further at the drivers using ide_host_register(), I see that
> falconide.c is missing a set_drvdata() call, while tx4939ide.c calls
> set_drvdata() after ide_host_register(). The latter example is not a bug.
>
> The pattern I used, that is, calling set_drvdata() after ide_host_add(),
> is actually more popular among IDE drivers than the pattern you suggested,
> that is, set_drvdata() followed by ide_host_register(). Either way, I
> don't see any bugs besides the one in falconide.c.
>
> Regarding falconide.c, my inclination is to send a fix following the more
> common pattern (among IDE drivers), as below. I guess that may prompt the
> subsystem maintainers to make known their views on the style question.

Please do - that is clearly a bug. I must admit I never tried to boot my 
Falcon off a SCSI partition to test falconide module unload.

Cheers,

     Michael


>
> diff --git a/drivers/ide/falconide.c b/drivers/ide/falconide.c
> index dbeb2605e5f6e..607c44bc50f1b 100644
> --- a/drivers/ide/falconide.c
> +++ b/drivers/ide/falconide.c
> @@ -166,6 +166,7 @@ static int __init falconide_init(struct platform_device *pdev)
>   	if (rc)
>   		goto err_free;
>   
> +	platform_set_drvdata(pdev, host);
>   	return 0;
>   err_free:
>   	ide_host_free(host);
> @@ -176,7 +177,7 @@ static int __init falconide_init(struct platform_device *pdev)
>   
>   static int falconide_remove(struct platform_device *pdev)
>   {
> -	struct ide_host *host = dev_get_drvdata(&pdev->dev);
> +	struct ide_host *host = platform_get_drvdata(pdev);
>   
>   	ide_host_remove(host);
>