[PATCH v2 2/2] net: eth-uclass: Fix data abort when tftp get nonexistent file via usb

[qianfanguijin@163.com]

From: qianfan Zhao <qianfanguijin@163.com>

tftp_handler do eth_halt when TFTP_ERROR, but eth_halt will remove eth
device if it is an usb network. usbeth's private data will be unaccessable
when usb_eth_free_pkt, touch it will trigger data abort.

Next is the console messages:

=> tftp xxx
...
Loading: *
TFTP error: 'open failed: No such file or directory' (1)
Not retrying...
data abort
pc : [<9feb6ba2>]          lr : [<9feb6b9f>]

Fix it.

Signed-off-by: qianfan Zhao <qianfanguijin@163.com>
---
 net/eth-uclass.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/net/eth-uclass.c b/net/eth-uclass.c
index c6eb1bc8f8..27baf52c26 100644
--- a/net/eth-uclass.c
+++ b/net/eth-uclass.c
@@ -405,6 +405,13 @@ int eth_rx(void)
 		flags = 0;
 		if (ret > 0)
 			net_process_received_packet(packet, ret);
+
+		/* ethernet maybe halted when packet_handler, check again */
+		if (!eth_is_active(current)) {
+			ret = 0;
+			break;
+		}
+
 		if (ret >= 0 && eth_get_ops(current)->free_pkt)
 			eth_get_ops(current)->free_pkt(current, packet, ret);
 		if (ret <= 0)
-- 
2.17.1