module_param: check type correctness for module_param_array

module_param_array(), unlike its non-array cousins, didn't check the type
of the variable.  Fixing this found two bugs.

Cc: Luca Risolia <luca.risolia@studio.unibo.it>
Cc: Mauro Carvalho Chehab <mchehab@infradead.org>
Cc: Eric Piel <eric.piel@tremplin-utc.net>
Cc: linux-media@vger.kernel.org
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

drivers/media/video/et61x251/et61x251_core.c

@@ -76,8 +76,8 @@ MODULE_PARM_DESC(video_nr,
 		 "\none and for every other camera."
 		 "\n");
 
-static short force_munmap[] = {[0 ... ET61X251_MAX_DEVICES-1] =
-			       ET61X251_FORCE_MUNMAP};
+static bool force_munmap[] = {[0 ... ET61X251_MAX_DEVICES-1] =
+			      ET61X251_FORCE_MUNMAP};
 module_param_array(force_munmap, bool, NULL, 0444);
 MODULE_PARM_DESC(force_munmap,
 		 "\n<0|1[,...]> Force the application to unmap previously"

drivers/media/video/sn9c102/sn9c102_core.c

@@ -75,8 +75,8 @@ MODULE_PARM_DESC(video_nr,
 		 "\none and for every other camera."
 		 "\n");
 
-static short force_munmap[] = {[0 ... SN9C102_MAX_DEVICES-1] =
-			       SN9C102_FORCE_MUNMAP};
+static bool force_munmap[] = {[0 ... SN9C102_MAX_DEVICES-1] =
+			      SN9C102_FORCE_MUNMAP};
 module_param_array(force_munmap, bool, NULL, 0444);
 MODULE_PARM_DESC(force_munmap,
 		 " <0|1[,...]>"

drivers/mfd/janz-cmodio.c

@@ -33,7 +33,7 @@
 
 /* Module Parameters */
 static unsigned int num_modules = CMODIO_MAX_MODULES;
-static unsigned char *modules[CMODIO_MAX_MODULES] = {
+static char *modules[CMODIO_MAX_MODULES] = {
 	"empty", "empty", "empty", "empty",
 };
 

drivers/misc/lis3lv02d/lis3lv02d.c

@@ -111,6 +111,8 @@ static struct kernel_param_ops param_ops_axis = {
 	.get = param_get_int,
 };
 
+#define param_check_axis(name, p) param_check_int(name, p)
+
 module_param_array_named(axes, lis3_dev.ac.as_array, axis, NULL, 0644);
 MODULE_PARM_DESC(axes, "Axis-mapping for x,y,z directions");
 

include/linux/moduleparam.h

@@ -395,6 +395,7 @@ extern int param_get_invbool(char *buffer, const struct kernel_param *kp);
  * module_param_named() for why this might be necessary.
  */
 #define module_param_array_named(name, array, type, nump, perm)		\
+	param_check_##type(name, &(array)[0]);				\
 	static const struct kparam_array __param_arr_##name		\
 	= { .max = ARRAY_SIZE(array), .num = nump,                      \
 	    .ops = &param_ops_##type,					\