rtlwifi: Handle previous allocation failures when freeing device memory

commit 7f66c2f93e5779625c10d262c84537427a2673ca upstream.

Handle previous allocation failures when freeing device memory

Signed-off-by: Simon Graham <simon.graham@virtualcomputer.com>
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/wireless/rtlwifi/pci.c b/drivers/net/wireless/rtlwifi/pci.c
index 19bb550dd39616ffda18da6e0d1a3d37d3beb13c..9afcad3c6cd694f5470fa7381127854f8ba37ddf 100644 (file)
--- a/drivers/net/wireless/rtlwifi/pci.c
+++ b/drivers/net/wireless/rtlwifi/pci.c
@@ -1155,10 +1155,12 @@ static void _rtl_pci_free_tx_ring(struct ieee80211_hw *hw,
                ring->idx = (ring->idx + 1) % ring->entries;
        }
 
-       pci_free_consistent(rtlpci->pdev,
-                           sizeof(*ring->desc) * ring->entries,
-                           ring->desc, ring->dma);
-       ring->desc = NULL;
+       if (ring->desc) {
+               pci_free_consistent(rtlpci->pdev,
+                                   sizeof(*ring->desc) * ring->entries,
+                                   ring->desc, ring->dma);
+               ring->desc = NULL;
+       }
 }
 
 static void _rtl_pci_free_rx_ring(struct rtl_pci *rtlpci)
@@ -1182,12 +1184,14 @@ static void _rtl_pci_free_rx_ring(struct rtl_pci *rtlpci)
                        kfree_skb(skb);
                }
 
-               pci_free_consistent(rtlpci->pdev,
+               if (rtlpci->rx_ring[rx_queue_idx].desc) {
+                       pci_free_consistent(rtlpci->pdev,
                                    sizeof(*rtlpci->rx_ring[rx_queue_idx].
                                           desc) * rtlpci->rxringcount,
                                    rtlpci->rx_ring[rx_queue_idx].desc,
                                    rtlpci->rx_ring[rx_queue_idx].dma);
-               rtlpci->rx_ring[rx_queue_idx].desc = NULL;
+                       rtlpci->rx_ring[rx_queue_idx].desc = NULL;
+               }
        }
 }