1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/net/tulip/tulip.h b/drivers/net/tulip/tulip.h
index 3f69f53d7768..908422f2f320 100644
--- a/drivers/net/tulip/tulip.h
+++ b/drivers/net/tulip/tulip.h
@@ -268,7 +268,12 @@ enum t21143_csr6_bits {
 #define RX_RING_SIZE    128
 #define MEDIA_MASK     31
 
-#define PKT_BUF_SZ              1536    /* Size of each temporary Rx buffer. */
+/* The receiver on the DC21143 rev 65 can fail to close the last
+ * receive descriptor in certain circumstances (see errata) when
+ * using MWI. This can only occur if the receive buffer ends on
+ * a cache line boundary, so the "+ 4" below ensures it doesn't.
+ */
+#define PKT_BUF_SZ      (1536 + 4)      /* Size of each temporary Rx buffer. */
 
 #define TULIP_MIN_CACHE_LINE    8       /* in units of 32-bit words */