linux-kernel - Re: [PATCH][v3] xhci: correctly enable interrupts

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Date:	Mon, 04 Mar 2013 21:08:49 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Thomas Renninger <trenn@...e.de>
CC:	Alan Stern <stern@...land.harvard.edu>,
	Hannes Reinecke <hare@...e.de>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
	Oliver Neukum <oneukum@...e.de>,
	Yinghai Lu <yinghai@...nel.org>,
	Frederik Himpe <fhimpe@....ac.be>,
	David Haerdeman <david@...deman.nu>
Subject: Re: [PATCH][v3] xhci: correctly enable interrupts

Hello.

On 03/04/2013 07:14 PM, Thomas Renninger wrote:

> From: Hannes Reinecke<hare@...e.de>
>
> xhci has its own interrupt enabling routine, which will try to
> use MSI-X/MSI if present. So the usb core shouldn't try to enable
> legacy interrupts; on some machines the xhci legacy IRQ setting
> is invalid.
>
> v3: Be careful to not break XHCI_BROKEN_MSI workaround (by trenn)
>
> Cc: Bjorn Helgaas<bhelgaas@...gle.com>
> Cc: Oliver Neukum<oneukum@...e.de>
> Cc: Thomas Renninger<trenn@...e.de>
> Cc: Yinghai Lu<yinghai@...nel.org>
> Cc: Frederik Himpe<fhimpe@....ac.be>
> Cc: David Haerdeman<david@...deman.nu>
> Cc: Alan Stern<stern@...land.harvard.edu>
>
> Reviewed-by: Thomas Renninger<trenn@...e.de>
> Signed-off-by: Hannes Reinecke<hare@...e.de>
    Still a couple of style comments...

[...]

> @@ -187,15 +188,19 @@ int usb_hcd_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
>   		return -ENODEV;
>   	dev->current_state = PCI_D0;
>
> -	/* The xHCI driver supports MSI and MSI-X,
> -	 * so don't fail if the BIOS doesn't provide a legacy IRQ.
> +	/*
> +	 * The xHCI driver has its own irq management
> +	 * make sure irq setup is not touched for xhci in generic hcd code
>   	 */
> -	if (!dev->irq&&  (driver->flags&  HCD_MASK) != HCD_USB3) {
> -		dev_err(&dev->dev,
> -			"Found HC with no IRQ.  Check BIOS/PCI %s setup!\n",
> -			pci_name(dev));
> -		retval = -ENODEV;
> -		goto disable_pci;
> +	if ((driver->flags&  HCD_MASK) != HCD_USB3) {
> +		if (!dev->irq) {
> +			dev_err(&dev->dev,
> +			"Found HC with no IRQ. Check BIOS/PCI %s setup!\n",
>    

    Could you indent the string like the line below?

> +				pci_name(dev));
> +			retval = -ENODEV;
> +			goto disable_pci;
> +		}
> +		hcd_irq = dev->irq;
>   	}
>
>   	hcd = usb_create_hcd(driver,&dev->dev, pci_name(dev));
>    
[...]
> diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
> index f1f01a8..849470b 100644
> --- a/drivers/usb/host/xhci.c
> +++ b/drivers/usb/host/xhci.c
>    
[...]
> @@ -371,6 +371,7 @@ static int xhci_try_enable_msi(struct usb_hcd *hcd)
>   		return -EINVAL;
>   	}
>
> + legacy_irq:
>    

    Labels shouldn't be indented by a space (unless the existing coding 
style has them indented already, of course).
Although that might be a rule dropped by checkpatch.pl already -- it 
doesn't complain.

WBR, Sergei

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