netdev - [PATCH RESEND] PCI: hv: Fix return value check in hv_pci_assign

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Date:   Fri, 21 Sep 2018 02:53:17 +0000
From:   Wei Yongjun <weiyongjun1@...wei.com>
To:     "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "Lorenzo Pieralisi" <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>
CC:     Wei Yongjun <weiyongjun1@...wei.com>,
        <devel@...uxdriverproject.org>, <linux-pci@...r.kernel.org>,
        <netdev@...r.kernel.org>, <kernel-janitors@...r.kernel.org>
Subject: [PATCH RESEND] PCI: hv: Fix return value check in hv_pci_assign_slots()

In case of error, the function pci_create_slot() returns ERR_PTR() and
never returns NULL. The NULL test in the return value check should be
replaced with IS_ERR().

Fixes: a15f2c08c708 ("PCI: hv: support reporting serial number as slot information")
Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>
---
Since the orig patch is merged from net tree, cc netdev@...r.kernel.org
---
 drivers/pci/controller/pci-hyperv.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c
index ee80e79..9ba4d12 100644
--- a/drivers/pci/controller/pci-hyperv.c
+++ b/drivers/pci/controller/pci-hyperv.c
@@ -1484,8 +1484,10 @@ static void hv_pci_assign_slots(struct hv_pcibus_device *hbus)
 		snprintf(name, SLOT_NAME_SIZE, "%u", hpdev->desc.ser);
 		hpdev->pci_slot = pci_create_slot(hbus->pci_bus, slot_nr,
 					  name, NULL);
-		if (!hpdev->pci_slot)
+		if (IS_ERR(hpdev->pci_slot)) {
 			pr_warn("pci_create slot %s failed\n", name);
+			hpdev->pci_slot = NULL;
+		}
 	}
 }