1 files changed, 16 insertions, 2 deletions

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index e944aac258e3..77337c3b4285 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -9695,10 +9695,24 @@ static int __devinit tg3_test_dma(struct tg3 *tp)
         }
         if ((tp->dma_rwctrl & DMA_RWCTRL_WRITE_BNDRY_MASK) !=
             DMA_RWCTRL_WRITE_BNDRY_16) {
+                static struct pci_device_id dma_wait_state_chipsets[] = {
+                        { PCI_DEVICE(PCI_VENDOR_ID_APPLE,
+                                     PCI_DEVICE_ID_APPLE_UNI_N_PCI15) },
+                        { },
+                };
+
                 /* DMA test passed without adjusting DMA boundary,
-                 * just restore the calculated DMA boundary
+                 * now look for chipsets that are known to expose the
+                 * DMA bug without failing the test.
                  */
-                tp->dma_rwctrl = saved_dma_rwctrl;
+                if (pci_dev_present(dma_wait_state_chipsets)) {
+                        tp->dma_rwctrl &= ~DMA_RWCTRL_WRITE_BNDRY_MASK;
+                        tp->dma_rwctrl |= DMA_RWCTRL_WRITE_BNDRY_16;
+                }
+                else
+                        /* Safe to use the calculated DMA boundary. */
+                        tp->dma_rwctrl = saved_dma_rwctrl;
+
                 tw32(TG3PCI_DMA_RW_CTRL, tp->dma_rwctrl);
         }