linux-kernel - Re: [PATCH v9 7/7] usb: Adding SuperSpeed support to dummy

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Date:	Mon, 9 May 2011 19:49:10 +0200
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Tatyana Brokhman <tlinder@...eaurora.org>
Cc:	greg@...ah.com, linux-usb@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, balbi@...com, ablay@...eaurora.org,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v9 7/7] usb: Adding SuperSpeed support to dummy_hcd

* Tatyana Brokhman | 2011-05-08 14:16:48 [+0300]:

> static int dummy_hcd_probe(struct platform_device *pdev)
> {
>-	struct usb_hcd		*hcd;
>+	struct usb_hcd		*hs_hcd;
>+	struct usb_hcd		*ss_hcd;
> 	int			retval;
> 
> 	dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc);
> 
>-	hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, dev_name(&pdev->dev));
>-	if (!hcd)
>+	hs_hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, dev_name(&pdev->dev));
>+	if (!hs_hcd)
> 		return -ENOMEM;
>-	the_controller = hcd_to_dummy (hcd);
> 
>-	retval = usb_add_hcd(hcd, 0, 0);
>-	if (retval != 0) {
>-		usb_put_hcd (hcd);
>-		the_controller = NULL;
>+	hs_hcd->speed = HCD_USB2;
Why do you overwrite the speed here and in ->reset()?

>+
>+	retval = usb_add_hcd(hs_hcd, 0, IRQF_DISABLED | IRQF_SHARED);
Why IRQF_DISABLED | IRQF_SHARED? you don't interrupts at all.

>+	if (retval != 0)
>+		usb_put_hcd(hs_hcd);
Your error recovery is broken here. You have to leave instead of
continue with SS.

>+	dev_set_drvdata(&pdev->dev, hs_hcd);
This is already done by usb_add_hcd()

>+
>+	ss_hcd = usb_create_shared_hcd(&dummy_hcd, &pdev->dev,
>+				dev_name(&pdev->dev), hs_hcd);
>+	if (!ss_hcd) {
>+		retval = -ENOMEM;
>+		goto dealloc_usb2_hcd;
> 	}
>+
>+	retval = usb_add_hcd(ss_hcd, 0, IRQF_DISABLED | IRQF_SHARED);
>+	if (retval)
>+		goto put_usb3_hcd;
>+
>+	return 0;
>+
>+put_usb3_hcd:
>+	usb_put_hcd(ss_hcd);
>+dealloc_usb2_hcd:
>+	usb_put_hcd(hs_hcd);
>+	the_controller.hs_hcd = the_controller.ss_hcd = NULL;
> 	return retval;
> }

Sebastian
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