linux-kernel - Re: [PATCH] pci/pci-sysfs: Set pci interface in uppercase

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Message-ID: <20140827202301.GA13800@kroah.com>
Date:	Wed, 27 Aug 2014 13:23:01 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pci/pci-sysfs: Set pci interface in uppercase

On Wed, Aug 27, 2014 at 02:57:57PM +0200, Ricardo Ribalda Delgado wrote:
> There is a missmatch between the way file2alias generates the modalias
> and the way the pci driver generates it.
> 
> Some implementations of modprobe will fail to load the driver for a pci
> device automatically when the pci interface is defined on the driver. As
> one will be in uppercase and the other in lowercase.
> 
> Fortunatelly not many drivers define this.
> 
> Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
> ---
>  drivers/pci/pci-sysfs.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
> index 9ff0a90..76ef791 100644
> --- a/drivers/pci/pci-sysfs.c
> +++ b/drivers/pci/pci-sysfs.c
> @@ -177,7 +177,7 @@ static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
>  {
>  	struct pci_dev *pci_dev = to_pci_dev(dev);
>  
> -	return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
> +	return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X\n",
>  		       pci_dev->vendor, pci_dev->device,
>  		       pci_dev->subsystem_vendor, pci_dev->subsystem_device,
>  		       (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),

As said in the other thread about this issue, no, this code has been
here for over 9 years just fine.  Please fix your userspace code that is
trying to compare hex values as a string and not a numeric value, that
is the stuff that is wrong, not the kernel.

thanks,

greg k-h
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