[PATCH] fix reading string module parameters in sysfs

[PATCH] fix reading string module parameters in sysfs

[Arnd Bergmann]

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Reading the contents of a module_param_string through sysfs currently
oopses because the param_get_charp() function cannot operate on a
kparam_string struct. This introduces the required param_get_string.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

===== include/linux/moduleparam.h 1.8 vs edited =====
--- 1.8/include/linux/moduleparam.h	Fri May 21 09:50:15 2004
+++ edited/include/linux/moduleparam.h	Wed Aug  4 16:16:23 2004
@@ -73,7 +73,7 @@
 #define module_param_string(name, string, len, perm)			\
 	static struct kparam_string __param_string_##name		\
 		= { len, string };					\
-	module_param_call(name, param_set_copystring, param_get_charp,	\
+	module_param_call(name, param_set_copystring, param_get_string,	\
 		   &__param_string_##name, perm)
 
 /* Called on module insert or kernel boot */
@@ -140,6 +140,7 @@
 extern int param_array_get(char *buffer, struct kernel_param *kp);
 
 extern int param_set_copystring(const char *val, struct kernel_param *kp);
+extern int param_get_string(char *buffer, struct kernel_param *kp);
 
 int param_array(const char *name,
 		const char *val,
===== kernel/params.c 1.8 vs edited =====
--- 1.8/kernel/params.c	Fri May  7 23:22:37 2004
+++ edited/kernel/params.c	Wed Aug  4 16:23:59 2004
@@ -339,6 +339,12 @@
 	return 0;
 }
 
+int param_get_string(char *buffer, struct kernel_param *kp)
+{
+	struct kparam_string *kps = kp->arg;
+	return strlcpy(buffer, kps->string, kps->maxlen);
+}
+
 EXPORT_SYMBOL(param_set_short);
 EXPORT_SYMBOL(param_get_short);
 EXPORT_SYMBOL(param_set_ushort);
@@ -360,3 +366,4 @@
 EXPORT_SYMBOL(param_array_set);
 EXPORT_SYMBOL(param_array_get);
 EXPORT_SYMBOL(param_set_copystring);
+EXPORT_SYMBOL(param_get_string);

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