From 1b58d58f76289212f40d71282ae3a85d6cd65fef Mon Sep 17 00:00:00 2001 From: Jean-Christophe Dubois Date: Thu, 25 Jan 2018 11:45:28 +0000 Subject: i.MX: Fix FEC/ENET receive funtions The actual imx_eth_enable_rx() function is buggy. It updates s->regs[ENET_RDAR] after calling qemu_flush_queued_packets(). qemu_flush_queued_packets() is going to call imx_XXX_receive() which itself is going to call imx_eth_enable_rx(). By updating s->regs[ENET_RDAR] after calling qemu_flush_queued_packets() we end up updating the register with an outdated value which might lead to disabling the receive function in the i.MX FEC/ENET device. This patch change the place where the register update is done so that the register value stays up to date and the receive function can keep running. Reported-by: Fyleo Tested-by: Fyleo Signed-off-by: Jean-Christophe Dubois Message-id: 20180113113445.2705-1-jcd@tribudubois.net Reviewed-by: Peter Maydell Reviewed-by: Andrey Smirnov Tested-by: Andrey Smirnov Signed-off-by: Peter Maydell --- hw/net/imx_fec.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) (limited to 'hw/net/imx_fec.c') diff --git a/hw/net/imx_fec.c b/hw/net/imx_fec.c index 4fb48f62ba..9506f9b69f 100644 --- a/hw/net/imx_fec.c +++ b/hw/net/imx_fec.c @@ -595,19 +595,16 @@ static void imx_eth_do_tx(IMXFECState *s, uint32_t index) static void imx_eth_enable_rx(IMXFECState *s, bool flush) { IMXFECBufDesc bd; - bool rx_ring_full; imx_fec_read_bd(&bd, s->rx_descriptor); - rx_ring_full = !(bd.flags & ENET_BD_E); + s->regs[ENET_RDAR] = (bd.flags & ENET_BD_E) ? ENET_RDAR_RDAR : 0; - if (rx_ring_full) { + if (!s->regs[ENET_RDAR]) { FEC_PRINTF("RX buffer full\n"); } else if (flush) { qemu_flush_queued_packets(qemu_get_queue(s->nic)); } - - s->regs[ENET_RDAR] = rx_ring_full ? 0 : ENET_RDAR_RDAR; } static void imx_eth_reset(DeviceState *d) @@ -866,7 +863,6 @@ static void imx_eth_write(void *opaque, hwaddr offset, uint64_t value, case ENET_RDAR: if (s->regs[ENET_ECR] & ENET_ECR_ETHEREN) { if (!s->regs[index]) { - s->regs[index] = ENET_RDAR_RDAR; imx_eth_enable_rx(s, true); } } else { -- cgit v1.2.3-55-g7522