i.MX: reset TX/RX descriptors when FEC is disabled.

According to the FEC chapter of i.MX25 reference manual

RX adn TX descriptors are reseted when the FEC device is disabled through ECR.

Signed-off-by: Jean-Christophe Dubois <jcd@tribudubois.net>
Signed-off-by: Jason Wang <jasowang@redhat.com>

diff --git a/hw/net/imx_fec.c b/hw/net/imx_fec.c
index 768181e3c10e7c7fdb3df8faca8d4a5567daa813..7369cfafe5c2387395055e2253ffdd80f36f1437 100644 (file)
--- a/hw/net/imx_fec.c
+++ b/hw/net/imx_fec.c
@@ -454,6 +454,8 @@ static void imx_fec_write(void *opaque, hwaddr addr,
         }
         if ((s->ecr & FEC_EN) == 0) {
             s->rx_enabled = 0;
+            s->rx_descriptor = s->erdsr;
+            s->tx_descriptor = s->etdsr;
         }
         break;
     case 0x040: /* MMFR */