param: update drivers/char/ipmi/ipmi_watchdog.c to new scheme

This is one of the most interesting users of module parameters in the
tree, so weaning it off the old-style non-const module_param_call
scheme is a useful exercise.

I was confused by set_param_int/get_param_int (vs. the normal
param_set_int and param_get_int), so I renamed set_param_int to
set_param_timeout, and re-used param_get_int directly instead of
get_param_int.  I also implemented param_check_wdog_ifnum and
param_check_timeout, so now the ifnum_to_use and timeout/pretimeout
parameters can just use plain module_param().
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Corey Minyard <minyard@acm.org>
Cc: openipmi-developer@lists.sourceforge.net

drivers/char/ipmi/ipmi_watchdog.c

@@ -196,7 +196,7 @@ static void ipmi_unregister_watchdog(int ipmi_intf);
  */
 static int start_now;
 
-static int set_param_int(const char *val, struct kernel_param *kp)
+static int set_param_timeout(const char *val, const struct kernel_param *kp)
 {
 	char *endp;
 	int  l;
@@ -215,10 +215,11 @@ static int set_param_int(const char *val, struct kernel_param *kp)
 	return rv;
 }
 
-static int get_param_int(char *buffer, struct kernel_param *kp)
-{
-	return sprintf(buffer, "%i", *((int *)kp->arg));
-}
+static struct kernel_param_ops param_ops_timeout = {
+	.set = set_param_timeout,
+	.get = param_get_int,
+};
+#define param_check_timeout param_check_int
 
 typedef int (*action_fn)(const char *intval, char *outval);
 
@@ -227,7 +228,7 @@ static int preaction_op(const char *inval, char *outval);
 static int preop_op(const char *inval, char *outval);
 static void check_parms(void);
 
-static int set_param_str(const char *val, struct kernel_param *kp)
+static int set_param_str(const char *val, const struct kernel_param *kp)
 {
 	action_fn  fn = (action_fn) kp->arg;
 	int        rv = 0;
@@ -251,7 +252,7 @@ static int set_param_str(const char *val, struct kernel_param *kp)
 	return rv;
 }
 
-static int get_param_str(char *buffer, struct kernel_param *kp)
+static int get_param_str(char *buffer, const struct kernel_param *kp)
 {
 	action_fn fn = (action_fn) kp->arg;
 	int       rv;
@@ -263,7 +264,7 @@ static int get_param_str(char *buffer, struct kernel_param *kp)
 }
 
 
-static int set_param_wdog_ifnum(const char *val, struct kernel_param *kp)
+static int set_param_wdog_ifnum(const char *val, const struct kernel_param *kp)
 {
 	int rv = param_set_int(val, kp);
 	if (rv)
@@ -276,27 +277,38 @@ static int set_param_wdog_ifnum(const char *val, struct kernel_param *kp)
 	return 0;
 }
 
-module_param_call(ifnum_to_use, set_param_wdog_ifnum, get_param_int,
-		  &ifnum_to_use, 0644);
+static struct kernel_param_ops param_ops_wdog_ifnum = {
+	.set = set_param_wdog_ifnum,
+	.get = param_get_int,
+};
+
+#define param_check_wdog_ifnum param_check_int
+
+static struct kernel_param_ops param_ops_str = {
+	.set = set_param_str,
+	.get = get_param_str,
+};
+
+module_param(ifnum_to_use, wdog_ifnum, 0644);
 MODULE_PARM_DESC(ifnum_to_use, "The interface number to use for the watchdog "
 		 "timer.  Setting to -1 defaults to the first registered "
 		 "interface");
 
-module_param_call(timeout, set_param_int, get_param_int, &timeout, 0644);
+module_param(timeout, timeout, 0644);
 MODULE_PARM_DESC(timeout, "Timeout value in seconds.");
 
-module_param_call(pretimeout, set_param_int, get_param_int, &pretimeout, 0644);
+module_param(pretimeout, timeout, 0644);
 MODULE_PARM_DESC(pretimeout, "Pretimeout value in seconds.");
 
-module_param_call(action, set_param_str, get_param_str, action_op, 0644);
+module_param_cb(action, &param_ops_str, action_op, 0644);
 MODULE_PARM_DESC(action, "Timeout action. One of: "
 		 "reset, none, power_cycle, power_off.");
 
-module_param_call(preaction, set_param_str, get_param_str, preaction_op, 0644);
+module_param_cb(preaction, &param_ops_str, preaction_op, 0644);
 MODULE_PARM_DESC(preaction, "Pretimeout action.  One of: "
 		 "pre_none, pre_smi, pre_nmi, pre_int.");
 
-module_param_call(preop, set_param_str, get_param_str, preop_op, 0644);
+module_param_cb(preop, &param_ops_str, preop_op, 0644);
 MODULE_PARM_DESC(preop, "Pretimeout driver operation.  One of: "
 		 "preop_none, preop_panic, preop_give_data.");