linux-kernel - Re: [PATCH RFC 01/77] PCI/MSI: Fix return value when populate_msi

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Date:	Wed, 2 Oct 2013 17:39:05 -0700
From:	Jon Mason <jon.mason@...el.com>
To:	Alexander Gordeev <agordeev@...hat.com>
Cc:	linux-kernel@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Michael Ellerman <michael@...erman.id.au>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Ingo Molnar <mingo@...hat.com>, Tejun Heo <tj@...nel.org>,
	Dan Williams <dan.j.williams@...el.com>,
	Andy King <acking@...are.com>,
	Matt Porter <mporter@...nel.crashing.org>,
	stable@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-mips@...ux-mips.org, linuxppc-dev@...ts.ozlabs.org,
	linux390@...ibm.com, linux-s390@...r.kernel.org, x86@...nel.org,
	linux-ide@...r.kernel.org, iss_storagedev@...com,
	linux-nvme@...ts.infradead.org, linux-rdma@...r.kernel.org,
	netdev@...r.kernel.org, e1000-devel@...ts.sourceforge.net,
	linux-driver@...gic.com,
	Solarflare linux maintainers <linux-net-drivers@...arflare.com>,
	"VMware, Inc." <pv-drivers@...are.com>, linux-scsi@...r.kernel.org
Subject: Re: [PATCH RFC 01/77] PCI/MSI: Fix return value when
 populate_msi_sysfs() failed

On Wed, Oct 02, 2013 at 12:48:17PM +0200, Alexander Gordeev wrote:
> Signed-off-by: Alexander Gordeev <agordeev@...hat.com>

Since you are changing the behavior of the msix_capability_init
function on populate_msi_sysfs error, a comment describing why in this
commit would be nice.

> ---
>  drivers/pci/msi.c |   11 +++++------
>  1 files changed, 5 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
> index d5f90d6..b43f391 100644
> --- a/drivers/pci/msi.c
> +++ b/drivers/pci/msi.c
> @@ -719,7 +719,7 @@ static int msix_capability_init(struct pci_dev *dev,
>  
>  	ret = arch_setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSIX);
>  	if (ret)
> -		goto error;
> +		goto out_avail;
>  
>  	/*
>  	 * Some devices require MSI-X to be enabled before we can touch the
> @@ -732,10 +732,8 @@ static int msix_capability_init(struct pci_dev *dev,
>  	msix_program_entries(dev, entries);
>  
>  	ret = populate_msi_sysfs(dev);
> -	if (ret) {
> -		ret = 0;
> -		goto error;
> -	}
> +	if (ret)
> +		goto out_free;
>  
>  	/* Set MSI-X enabled bits and unmask the function */
>  	pci_intx_for_msi(dev, 0);
> @@ -746,7 +744,7 @@ static int msix_capability_init(struct pci_dev *dev,
>  
>  	return 0;
>  
> -error:
> +out_avail:
>  	if (ret < 0) {
>  		/*
>  		 * If we had some success, report the number of irqs
> @@ -763,6 +761,7 @@ error:
>  			ret = avail;
>  	}
>  
> +out_free:
>  	free_msi_irqs(dev);
>  
>  	return ret;
> -- 
> 1.7.7.6
> 
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