Merge pull request #27 in BIDU/software from bugfix/driver_reload_crash to master

* commit '22d6242d':
  Fix for the memory leak which leads to eventual crash of the linux kernel

Pcie40Driver/altera_dma.c

@@ -486,6 +486,14 @@ void altera_pci_remove(struct pci_dev *dev)
   //unmap_bars(bk_ptr, dev);
   pci_release_regions(dev);
 
+  // free GFP_ATOMIC memory regions
+  {
+    int i, j;
+    for (i = 0; i < LINK_NUMBER; i++)
+      for (j = 0; j < S_PAGES; j++)
+        pci_free_consistent(dev, S_PAGE_SIZE, bk_ptr->spt[i][j].spage_virt_addr, bk_ptr->spt[i][j].spage_bus_addr);
+  }
+
   kfree(bk_ptr);
 }