linux-kernel - Re: [PATCH v2 3/7] PCI: Remove VFs in reverse order if virtfn

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Date:	Fri, 30 Oct 2015 13:09:04 +0800
From:	Wei Yang <weiyang@...ux.vnet.ibm.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Alexander Duyck <aduyck@...antis.com>, linux-pci@...r.kernel.org,
	Ethan Zhao <ethan.zhao@...cle.com>,
	Wei Yang <weiyang@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/7] PCI: Remove VFs in reverse order if virtfn_add()
 fails

On Thu, Oct 29, 2015 at 05:23:08PM -0500, Bjorn Helgaas wrote:
>From: Alexander Duyck <aduyck@...antis.com>
>
>If virtfn_add() fails, we call virtfn_remove() for any previously added
>devices.  Remove the devices in reverse order (first-added is
>last-removed), which is more natural and doesn't require an additional
>variable.
>
>[bhelgaas: changelog, split to separate patch for reviewability]
>Signed-off-by: Alexander Duyck <aduyck@...antis.com>
>Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>

Interesting.

Reviewed-by: Wei Yang <weiyang@...ux.vnet.ibm.com>

>---
> drivers/pci/iov.c |    6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
>diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
>index ca400a9..c86d94c 100644
>--- a/drivers/pci/iov.c
>+++ b/drivers/pci/iov.c
>@@ -233,7 +233,7 @@ int __weak pcibios_sriov_enable(struct pci_dev *pdev, u16 num_vfs)
> static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
> {
> 	int rc;
>-	int i, j;
>+	int i;
> 	int nres;
> 	u16 initial;
> 	struct resource *res;
>@@ -328,8 +328,8 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
> 	return 0;
>
> failed:
>-	for (j = 0; j < i; j++)
>-		virtfn_remove(dev, j, 0);
>+	while (i--)
>+		virtfn_remove(dev, i, 0);
>
> 	iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
> 	pci_cfg_access_lock(dev);

-- 
Richard Yang
Help you, Help me

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