From 60177b26171a8f13be1b2d061db36784fc86a861 Mon Sep 17 00:00:00 2001
From: Leonid Iziumtsev <leonid.iziumtsev@gmail.com>
Date: Tue, 8 May 2018 15:55:50 +0200
Subject: [PATCH] net: Protect net_state from reentrant net_loop()
Global variable "net_state" is used in net_loop() state-machine.
But it happens that some times the net_loop() can be called
multiple times in the same call stack. For example when the
netconsole is enabled and we print the message while some other
net protocol is in action. Netconsole will overwrite the "net_state"
and that will break the logic for earlier started protocol.
To protect the state save and restore "net_state" variable each
time when we enter and exit net_loop().
Signed-off-by: Leonid Iziumtsev <leonid.iziumtsev@se.atlascopco.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
---
net/net.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/net/net.c b/net/net.c
index a4932f46d9..b4563a4cab 100644
--- a/net/net.c
+++ b/net/net.c
@@ -393,6 +393,7 @@ void net_init(void)
int net_loop(enum proto_t protocol)
{
int ret = -EINVAL;
+ enum net_loop_state prev_net_state = net_state;
net_restarted = 0;
net_dev_exists = 0;
@@ -430,6 +431,7 @@ restart:
case 1:
/* network not configured */
eth_halt();
+ net_set_state(prev_net_state);
return -ENODEV;
case 2:
@@ -655,6 +657,7 @@ done:
net_set_udp_handler(NULL);
net_set_icmp_handler(NULL);
#endif
+ net_set_state(prev_net_state);
return ret;
}
--
2.39.5