[NET] netconsole: Simplify boot/module option setup logic

Based upon initial work by Keiichi Kii <k-keiichi@bx.jp.nec.com>.

Presently, boot/module parameters are set up quite differently for the case of
built-in netconsole (__setup() -> obsolete_checksetup() ->
netpoll_parse_options() -> strlen(config) == 0 in init_netconsole()) vs
modular netconsole (module_param_string() -> string copied to the config
variable -> strlen(config) != 0 init_netconsole() -> netpoll_parse_options()).

This patch makes both of them similar by doing exactly the equivalent of a
module_param_string() in option_setup() also -- just copying the param string
passed from the kernel command line into "config" variable.  So,
strlen(config) != 0 in both cases, and netpoll_parse_options() is always
called from init_netconsole(), thus making the setup logic for both cases
similar.

Now, option_setup() is only ever called / used for the built-in case, so we
put it inside a #ifndef MODULE, otherwise gcc will complain about
option_setup() being "defined but not used".  Also, the "configured" variable
is redundant with this patch and hence removed.

Signed-off-by: Satyam Sharma <satyam@infradead.org>
Signed-off-by: Keiichi Kii <k-keiichi@bx.jp.nec.com>
Acked-by: Matt Mackall <mpm@selenic.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 14 insertions, 13 deletions

diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
index 2c2aef1ae8e..e56aa6c9743 100644
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c
@@ -53,6 +53,15 @@ static char config[MAX_PARAM_LENGTH];
 module_param_string(netconsole, config, MAX_PARAM_LENGTH, 0);
 MODULE_PARM_DESC(netconsole, " netconsole=[src-port]@[src-ip]/[dev],[tgt-port]@<tgt-ip>/[tgt-macaddr]\n");
 
+#ifndef MODULE
+static int __init option_setup(char *opt)
+{
+        strlcpy(config, opt, MAX_PARAM_LENGTH);
+        return 1;
+}
+__setup("netconsole=", option_setup);
+#endif  /* MODULE */
+
 static struct netpoll np = {
         .name           = "netconsole",
         .dev_name       = "eth0",
@@ -60,7 +69,6 @@ static struct netpoll np = {
         .remote_port    = 6666,
         .remote_mac     = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff},
 };
-static int configured;
 
 static void write_msg(struct console *con, const char *msg, unsigned int len)
 {
@@ -85,26 +93,19 @@ static struct console netconsole = {
         .write  = write_msg,
 };
 
-static int __init option_setup(char *opt)
-{
-        configured = !netpoll_parse_options(&np, opt);
-        return 1;
-}
-
-__setup("netconsole=", option_setup);
-
 static int __init init_netconsole(void)
 {
         int err = 0;
 
-        if (strnlen(config, MAX_PARAM_LENGTH))
-                option_setup(config);
-
-        if (!configured) {
+        if (!strnlen(config, MAX_PARAM_LENGTH)) {
                 printk(KERN_INFO "netconsole: not configured, aborting\n");
                 goto out;
         }
 
+        err = netpoll_parse_options(&np, config);
+        if (err)
+                goto out;
+
         err = netpoll_setup(&np);
         if (err)
                 goto out;