From: Tomas Hruby <tom@minix3.org>
Date: Thu, 7 Feb 2013 09:50:58 +0000 (+0000)
Subject: LWIP - avoid an assert when a driver restarts
X-Git-Tag: v3.3.0~1065
X-Git-Url: http://zhaoyanbai.com/repos/Bv9ARM.ch13.html?a=commitdiff_plain;h=9582cbffc568e129d53a39c92f7438b63d62de87;p=minix.git

LWIP - avoid an assert when a driver restarts
---

diff --git a/servers/lwip/driver.c b/servers/lwip/driver.c
index 473689ac7..bc139384a 100644
--- a/servers/lwip/driver.c
+++ b/servers/lwip/driver.c
@@ -430,6 +430,15 @@ void driver_up(const char * label, endpoint_t ep)
 	nic->tx_buffer = debug_malloc(2048);
 	if (nic->tx_buffer == NULL)
 		panic("Cannot allocate tx_buffer");
+	/* When driver restarts, the rx_pbuf is likely ready to receive data
+	 * from its previous instance. We free the buffer here, nobody depends
+	 * on it. A new one is allocated when we send a new read request to the
+	 * driver.
+	 */
+	if (nic->rx_pbuf) {
+		pbuf_free(nic->rx_pbuf);
+		nic->rx_pbuf = NULL;
+	}
 
 	/* prepare the RX grant once and forever */
 	if (cpf_setgrant_direct(nic->rx_iogrant,