ks8851: Fix interpretation of rxlen field.

[ Upstream commit 14bc435ea54cb888409efb54fc6b76c13ef530e9 ]

According to the Datasheet (page 52):
15-12 Reserved
11-0 RXBC Receive Byte Count
This field indicates the present received frame byte size.

The code has a bug:
                 rxh = ks8851_rdreg32(ks, KS_RXFHSR);
                 rxstat = rxh & 0xffff;
                 rxlen = rxh >> 16; // BUG!!! 0xFFF mask should be applied

Signed-off-by: Max Nekludov <Max.Nekludov@us.elster.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/micrel/ks8851.c b/drivers/net/ethernet/micrel/ks8851.c
index 286816a4e7833c27e2e994a400be44f968c4c354..1e428820b6a276202169f39234524a6e5ebb3a02 100644 (file)
--- a/drivers/net/ethernet/micrel/ks8851.c
+++ b/drivers/net/ethernet/micrel/ks8851.c
@@ -547,7 +547,7 @@ static void ks8851_rx_pkts(struct ks8851_net *ks)
        for (; rxfc != 0; rxfc--) {
                rxh = ks8851_rdreg32(ks, KS_RXFHSR);
                rxstat = rxh & 0xffff;
-               rxlen = rxh >> 16;
+               rxlen = (rxh >> 16) & 0xfff;
 
                netif_dbg(ks, rx_status, ks->netdev,
                          "rx: stat 0x%04x, len 0x%04x\n", rxstat, rxlen);