pasemi_mac: mac_to_intf() error not noticed

mac_to_intf() can return -1 when no device or function is found, but when
mac->dma_if is unsigned. The error wasn't noticed.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/net/pasemi_mac.c b/drivers/net/pasemi_mac.c
index 6ea4539085d5..c254a7f5b9f5 100644
--- a/drivers/net/pasemi_mac.c
+++ b/drivers/net/pasemi_mac.c
@@ -1733,7 +1733,7 @@ pasemi_mac_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 {
         struct net_device *dev;
         struct pasemi_mac *mac;
-        int err;
+        int err, ret;
 
         err = pci_enable_device(pdev);
         if (err)
@@ -1791,12 +1791,13 @@ pasemi_mac_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
         }
         memcpy(dev->dev_addr, mac->mac_addr, sizeof(mac->mac_addr));
 
-        mac->dma_if = mac_to_intf(mac);
-        if (mac->dma_if < 0) {
+        ret = mac_to_intf(mac);
+        if (ret < 0) {
                 dev_err(&mac->pdev->dev, "Can't map DMA interface\n");
                 err = -ENODEV;
                 goto out;
         }
+        mac->dma_if = ret;
 
         switch (pdev->device) {
         case 0xa005: