From: Alexander Stein <alexander.stein@informatik.tu-chemnitz.de>
Date: Tue, 11 Jan 2011 09:07:09 +0000 (-0800)
Subject: Input: fix force feedback capability query example
X-Git-Tag: v2.6.38-rc1~247^2^2~1
X-Git-Url: https://git.kernelconcepts.de/?a=commitdiff_plain;h=e1336bff92c6e0f4e6212af13f11d20c29a900a2;p=karo-tx-linux.git

Input: fix force feedback capability query example

'features' is a bit array, not byte array

Signed-off-by: Alexander Stein <alexander.stein@informatik.tu-chemnitz.de>
Acked-by: Anssi Hannula <anssi.hannula@iki.fi>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
---

diff --git a/Documentation/input/ff.txt b/Documentation/input/ff.txt
index ded4d5f53109..b3867bf49f8f 100644
--- a/Documentation/input/ff.txt
+++ b/Documentation/input/ff.txt
@@ -49,7 +49,9 @@ This information is subject to change.
 #include <linux/input.h>
 #include <sys/ioctl.h>
 
-unsigned long features[1 + FF_MAX/sizeof(unsigned long)];
+#define BITS_TO_LONGS(x) \
+	(((x) + 8 * sizeof (unsigned long) - 1) / (8 * sizeof (unsigned long)))
+unsigned long features[BITS_TO_LONGS(FF_CNT)];
 int ioctl(int file_descriptor, int request, unsigned long *features);
 
 "request" must be EVIOCGBIT(EV_FF, size of features array in bytes )