Commit d2b60881 authored Aug 10, 2007 by Satyam Sharma Committed by David S. Miller Oct 10, 2007

[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>

parent d133ccbd

drivers/net/netconsole.c

+14 −13

Original line number	Diff line number	Diff line
		@@ -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;