From bf5060a8c2deade2516d1cfeccae7137e740b4c4 Mon Sep 17 00:00:00 2001
From: zer0 <zer0@carbon.local>
Date: Tue, 4 May 2010 19:13:46 +0200
Subject: [PATCH] fix possible overflow in blocking detection, and reindent

---
 .../blocking_detection_manager.c              | 11 +++++-
 .../blocking_detection_manager.h              | 34 +++++++++----------
 2 files changed, 27 insertions(+), 18 deletions(-)

diff --git a/modules/devices/robot/blocking_detection_manager/blocking_detection_manager.c b/modules/devices/robot/blocking_detection_manager/blocking_detection_manager.c
index 8b5f547..1e3808b 100644
--- a/modules/devices/robot/blocking_detection_manager/blocking_detection_manager.c
+++ b/modules/devices/robot/blocking_detection_manager/blocking_detection_manager.c
@@ -71,6 +71,15 @@ void bd_reset(struct blocking_detection * bd)
 	IRQ_UNLOCK(flags);
 }
 
+static inline  uint8_t same_sign(int32_t a, int32_t b)
+{
+	if (a >= 0 && b >= 0)
+		return 1;
+	if (a < 0 && b < 0)
+		return 1;
+	return 0;
+}
+
 /** function to be called periodically */
 void bd_manage_from_speed_cmd(struct blocking_detection * bd,
 			      int32_t speed, int32_t cmd)
@@ -87,7 +96,7 @@ void bd_manage_from_speed_cmd(struct blocking_detection * bd,
 	 * has the same sign than i */
 	if ((uint32_t)ABS(i) > bd->i_thres &&
 	    (bd->speed_thres == 0 || ABS(speed) < bd->speed_thres) &&
-	    (i * cmd > 0)) {
+	    same_sign(i, cmd)) {
 		if (bd->cpt == bd->cpt_thres - 1)
 			WARNING(E_BLOCKING_DETECTION_MANAGER,
 				"BLOCKING cmd=%ld, speed=%ld i=%ld",
diff --git a/modules/devices/robot/blocking_detection_manager/blocking_detection_manager.h b/modules/devices/robot/blocking_detection_manager/blocking_detection_manager.h
index 27b7897..4afce09 100644
--- a/modules/devices/robot/blocking_detection_manager/blocking_detection_manager.h
+++ b/modules/devices/robot/blocking_detection_manager/blocking_detection_manager.h
@@ -1,6 +1,6 @@
-/*  
+/*
  *  Copyright Droids Corporation (2007)
- * 
+ *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
  *  the Free Software Foundation; either version 2 of the License, or
@@ -30,14 +30,14 @@
 
 #include <control_system_manager.h>
 
-/* detect blocking based on motor current. 
+/* detect blocking based on motor current.
  * triggers the blocking if:
- *   - the current in the motor is a above a threshold 
+ *   - the current in the motor is a above a threshold
  *     during n tests
  *   - the speed is below the threshold (if specified)
  *
  * We suppose that i = k1.V - k2.w
- * (V is the voltage applied on the motor, and w the current speed 
+ * (V is the voltage applied on the motor, and w the current speed
  * of the motor)
  */
 
@@ -59,34 +59,34 @@ struct blocking_detection {
 };
 
 /** init module, give the cs as parameter */
-void bd_init(struct blocking_detection * bd);
+void bd_init(struct blocking_detection *bd);
 
-/** thresholds for current-based blocking detection. If cpt_thres 
+/** thresholds for current-based blocking detection. If cpt_thres
  *  is 0, disable it. */
-void bd_set_current_thresholds(struct blocking_detection * bd, 
-			       int32_t k1, int32_t k2, 
+void bd_set_current_thresholds(struct blocking_detection *bd,
+			       int32_t k1, int32_t k2,
 			       uint32_t i_thres, uint16_t cpt_thres);
 
 /** speed threshold: if speed is above it, disable
- *  blocking_detection. */
-void bd_set_speed_threshold(struct blocking_detection * bd, 
+ * blocking_detection. */
+void bd_set_speed_threshold(struct blocking_detection *bd,
 			    uint16_t speed);
 
 /** reset the blocking */
-void bd_reset(struct blocking_detection * bd);
+void bd_reset(struct blocking_detection *bd);
 
-/** function to be called periodicallyn, when we use cs structure */
-void bd_manage_from_cs(struct blocking_detection * bd, struct cs *cs);
+/** function to be called periodically, when we use cs structure */
+void bd_manage_from_cs(struct blocking_detection *bd, struct cs *cs);
 
 /** function to be called periodically, when we use values directly */
-void bd_manage_from_pos_cmd(struct blocking_detection * bd, 
+void bd_manage_from_pos_cmd(struct blocking_detection *bd,
 			    int32_t pos, int32_t cmd);
 
 /** function to be called periodically, when we use values directly */
-void bd_manage_from_speed_cmd(struct blocking_detection * bd, 
+void bd_manage_from_speed_cmd(struct blocking_detection *bd,
 			      int32_t speed, int32_t cmd);
 
 /** get value of blocking detection */
-uint8_t bd_get(struct blocking_detection * bd);
+uint8_t bd_get(struct blocking_detection *bd);
 
 #endif
-- 
2.39.5