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

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Message-ID: <20151029222308.11908.95902.stgit@bhelgaas-glaptop2.roam.corp.google.com>
Date:	Thu, 29 Oct 2015 17:23:08 -0500
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Alexander Duyck <aduyck@...antis.com>
Cc:	linux-pci@...r.kernel.org, Ethan Zhao <ethan.zhao@...cle.com>,
	Wei Yang <weiyang@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 3/7] PCI: Remove VFs in reverse order if virtfn_add()
 fails

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>
---
 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);

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