ixgbe: fix pci device refcount leak

commit b93fb4405fcb5112c5739c5349afb52ec7f15c07 upstream.

As the comment of pci_get_domain_bus_and_slot() says, it
returns a PCI device with refcount incremented, when finish
using it, the caller must decrement the reference count by
calling pci_dev_put().

In ixgbe_get_first_secondary_devfn() and ixgbe_x550em_a_has_mii(),
pci_dev_put() is called to avoid leak.

Fixes: 8fa10ef01260 ("ixgbe: register a mdiobus")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Tested-by: Gurucharan G <gurucharanx.g@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c
index 24aa97f..123dca9 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c
@@ -855,9 +855,11 @@ static struct pci_dev *ixgbe_get_first_secondary_devfn(unsigned int devfn)
        rp_pdev = pci_get_domain_bus_and_slot(0, 0, devfn);
        if (rp_pdev && rp_pdev->subordinate) {
                bus = rp_pdev->subordinate->number;
+               pci_dev_put(rp_pdev);
                return pci_get_domain_bus_and_slot(0, bus, 0);
        }
 
+       pci_dev_put(rp_pdev);
        return NULL;
 }
 
@@ -874,6 +876,7 @@ static bool ixgbe_x550em_a_has_mii(struct ixgbe_hw *hw)
        struct ixgbe_adapter *adapter = hw->back;
        struct pci_dev *pdev = adapter->pdev;
        struct pci_dev *func0_pdev;
+       bool has_mii = false;
 
        /* For the C3000 family of SoCs (x550em_a) the internal ixgbe devices
         * are always downstream of root ports @ 0000:00:16.0 & 0000:00:17.0
@@ -884,15 +887,16 @@ static bool ixgbe_x550em_a_has_mii(struct ixgbe_hw *hw)
        func0_pdev = ixgbe_get_first_secondary_devfn(PCI_DEVFN(0x16, 0));
        if (func0_pdev) {
                if (func0_pdev == pdev)
-                       return true;
-               else
-                       return false;
+                       has_mii = true;
+               goto out;
        }
        func0_pdev = ixgbe_get_first_secondary_devfn(PCI_DEVFN(0x17, 0));
        if (func0_pdev == pdev)
-               return true;
+               has_mii = true;
 
-       return false;
+out:
+       pci_dev_put(func0_pdev);
+       return has_mii;
 }
 
 /**