diff -ru linux-2.2.7/drivers/net/de4x5.c linux-2.2.7-macx-de4x5/drivers/net/de4x5.c
--- linux-2.2.7/drivers/net/de4x5.c     Wed Dec 30 18:09:18 1998
+++ linux-2.2.7-macx-de4x5/drivers/net/de4x5.c  Sun Jan 10 20:43:26 1999
@@ -643,12 +643,20 @@
 #define ALIGN64     ((u_long)64 - 1)    /* 16 longword align */
 #define ALIGN128    ((u_long)128 - 1)   /* 32 longword align */

+#ifndef __powerpc__
 #define ALIGN         ALIGN32           /* Keep the DC21040 happy... */
 #define CACHE_ALIGN   CAL_16LONG
 #define DESC_SKIP_LEN DSL_0             /* Must agree with DESC_ALIGN */
 /*#define DESC_ALIGN    u32 dummy[4];  / * Must agree with DESC_SKIP_LEN */
 #define DESC_ALIGN

+#else /* __powerpc__ */
+#define ALIGN         ALIGN32           /* Keep the DC21040 happy... */
+#define CACHE_ALIGN   CAL_8LONG
+#define DESC_SKIP_LEN DSL_4             /* Must agree with DESC_ALIGN */
+#define DESC_ALIGN    u32 dummy[4];    /* Must agree with DESC_SKIP_LEN */
+#endif /* __powerpc__ */
+
 #ifndef DEC_ONLY                        /* See README.de4x5 for using this */
 static int dec_only = 0;
 #else
@@ -753,6 +761,9 @@
 struct de4x5_private {
     char adapter_name[80];                  /* Adapter name                 */
     u_long interrupt;                       /* Aligned ISR flag             */
+#ifdef __powerpc__
+    u_long dummy[3];                       /* Keep rx_ring 32-byte aligned */
+#endif
     struct de4x5_desc rx_ring[NUM_RX_DESC]; /* RX descriptor ring           */
     struct de4x5_desc tx_ring[NUM_TX_DESC]; /* TX descriptor ring           */
     struct sk_buff *tx_skb[NUM_TX_DESC];    /* TX skb for freeing when sent */
@@ -1556,8 +1567,9 @@
        }
        if (skb) de4x5_putb_cache(dev, skb);
     }
-
-    lp->cache.lock = 0;
+
+    if (!lp->interrupt)
+       lp->cache.lock = 0;

     return status;
 }