linux-kernel - Re: [PATCH v2 2/6] PCI/MSI: Factor out pci_get_msi

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Message-ID: <20130905130902.GA26314@htj.dyndns.org>
Date:	Thu, 5 Sep 2013 09:09:02 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Alexander Gordeev <agordeev@...hat.com>
Cc:	linux-kernel@...r.kernel.org, x86@...nel.org,
	linux-pci@...r.kernel.org, linux-ide@...r.kernel.org,
	Ingo Molnar <mingo@...nel.org>, Joerg Roedel <joro@...tes.org>,
	Jan Beulich <JBeulich@...e.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH v2 2/6] PCI/MSI: Factor out pci_get_msi_cap() interface

Hello, Alexander.

On Thu, Sep 05, 2013 at 02:52:47PM +0200, Alexander Gordeev wrote:
> -int pci_enable_msi_block_part(struct pci_dev *dev,
> -			      unsigned int nvec, int nvec_mme)
> +int pci_get_msi_cap(struct pci_dev *dev)
>  {
> -	int status, maxvec;
> +	int ret;
>  	u16 msgctl;
>  
>  	if (!dev->msi_cap)
>  		return -EINVAL;
>  
>  	pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &msgctl);
> -	maxvec = 1 << ((msgctl & PCI_MSI_FLAGS_QMASK) >> 1);
> +	ret = 1 << ((msgctl & PCI_MSI_FLAGS_QMASK) >> 1);
> +
> +	return ret;
> +}
> +EXPORT_SYMBOL(pci_get_msi_cap);

One curiosity - with the above factored out, is
pci_enable_msi_block_part() returning positive number still necessary?
I followed most of code paths in x86 and nothing seems to need it and
positive return seems to be just causing confusion - ie. returning 1
on multiple msi config failure from some functions, which is silly.

Thanks.

-- 
tejun
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