linux-kernel - [PATCH] smiapp: Fix BUG_ON() on an impossible condition

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Date:	Wed,  6 Nov 2013 15:21:30 +0100
From:	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
To:	Sakari Ailus <sakari.ailus@....fi>,
	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	linux-media@...r.kernel.org (open list:SMIA AND SMIA++ I...),
	linux-kernel@...r.kernel.org (open list)
Cc:	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Subject: [PATCH] smiapp: Fix BUG_ON() on an impossible condition

internal_csi_format_idx and csi_format_idx are unsigned integers,
therefore they can never be nevative.

CC      drivers/media/i2c/smiapp/smiapp-core.o
In file included from include/linux/err.h:4:0,
                 from include/linux/clk.h:15,
                 from drivers/media/i2c/smiapp/smiapp-core.c:29:
drivers/media/i2c/smiapp/smiapp-core.c: In function ‘smiapp_update_mbus_formats’:
include/linux/kernel.h:669:20: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
 #define min(x, y) ({    \
                    ^
include/linux/compiler.h:153:42: note: in definition of macro ‘unlikely’
 # define unlikely(x) __builtin_expect(!!(x), 0)
                                          ^
drivers/media/i2c/smiapp/smiapp-core.c:402:2: note: in expansion of macro ‘BUG_ON’
  BUG_ON(min(internal_csi_format_idx, csi_format_idx) < 0);
  ^
drivers/media/i2c/smiapp/smiapp-core.c:402:9: note: in expansion of macro ‘min’
  BUG_ON(min(internal_csi_format_idx, csi_format_idx) < 0);
         ^

Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
---
 drivers/media/i2c/smiapp/smiapp-core.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/media/i2c/smiapp/smiapp-core.c b/drivers/media/i2c/smiapp/smiapp-core.c
index ae66d91..fbd48f0 100644
--- a/drivers/media/i2c/smiapp/smiapp-core.c
+++ b/drivers/media/i2c/smiapp/smiapp-core.c
@@ -399,7 +399,6 @@ static void smiapp_update_mbus_formats(struct smiapp_sensor *sensor)
 
 	BUG_ON(max(internal_csi_format_idx, csi_format_idx) + pixel_order
 	       >= ARRAY_SIZE(smiapp_csi_data_formats));
-	BUG_ON(min(internal_csi_format_idx, csi_format_idx) < 0);
 
 	dev_dbg(&client->dev, "new pixel order %s\n",
 		pixel_order_str[pixel_order]);
-- 
1.8.4.rc3

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