linux-kernel - Re: [PATCH][v2] xhci: correctly enable interrupts

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Date:	Mon, 04 Mar 2013 17:27:47 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Hannes Reinecke <hare@...e.de>
CC:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Oliver Neukum <oneukum@...e.de>,
	Thomas Renninger <trenn@...e.de>,
	Yinghai Lu <yinghai@...nel.org>,
	Frederik Himpe <fhimpe@....ac.be>,
	David Haerdeman <david@...deman.nu>,
	Alan Stern <stern@...land.harvard.edu>
Subject: Re: [PATCH][v2] xhci: correctly enable interrupts

Hello.

On 04-03-2013 12:22, Hannes Reinecke wrote:

> 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.

> 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>
> Signed-off-by: Hannes Reinecke <hare@...e.de>

> diff --git a/drivers/usb/core/hcd-pci.c b/drivers/usb/core/hcd-pci.c
> index 622b4a4..2647e75 100644
> --- a/drivers/usb/core/hcd-pci.c
> +++ b/drivers/usb/core/hcd-pci.c
[...]
> @@ -187,15 +188,21 @@ 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 supports MSI and MSI-X,
> +	 * so don't fail if the BIOS doesn't provide a legacy IRQ
> +	 * and do not try to enable legacy IRQs.
>   	 */
> -	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",

    The message strings are allowed to take more than 80 chars (to facilitate 
grepping for them), so no need to break this one; checkpatch.pl should not 
complain...

> +				pci_name(dev));
> +			retval = -ENODEV;
> +			goto disable_pci;
> +		}
> +		hcd_irq = dev->irq;
>   	}
>
>   	hcd = usb_create_hcd(driver, &dev->dev, pci_name(dev));

WBR, Sergei

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