[PATCH RESEND] PCI: hv: Fix return value check in hv_pci_assign_slots()

[Wei Yongjun]

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 <weiyongj...@huawei.com>
---
Since the orig patch is merged from net tree, cc netdev@vger.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;
+               }
        }
 }