fix: using joysticks in 32 bit applications on 64 bit systems

unfortunately 32 bit apps don't see the joysticks on a 64 bit system.
this prevents one playing X-Plane (http://www.x-plane.com/) or other
32-bit games with joysticks.

this is a known issue, and already raised several times:

 http://readlist.com/lists/vger.kernel.org/linux-kernel/28/144411.html

 http://www.brettcsmith.org/wiki/wiki.cgi?action=browse&diff=1&id=OzyComputer/Joystick

unfortunately this is still not fixed in the mainline kernel.

it would be nice to have this fixed, so that people can play these games
without having to patch their kernel.

the following patch solves the problem on 2.6.22.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index e8b7c3a98a544922f886cf19631aab5a258ec101..da8cb3b3592c96ade1614ab8e553b5e16597b42a 100644 (file)
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -10,6 +10,8 @@
  * ioctls.
  */
 
+#include <linux/joystick.h>
+
 #include <linux/types.h>
 #include <linux/compat.h>
 #include <linux/kernel.h>
@@ -2642,6 +2644,12 @@ COMPATIBLE_IOCTL(VIDEO_SET_ATTRIBUTES)
 COMPATIBLE_IOCTL(VIDEO_GET_SIZE)
 COMPATIBLE_IOCTL(VIDEO_GET_FRAME_RATE)
 
+/* joystick */
+COMPATIBLE_IOCTL(JSIOCGVERSION)
+COMPATIBLE_IOCTL(JSIOCGAXES)
+COMPATIBLE_IOCTL(JSIOCGBUTTONS)
+COMPATIBLE_IOCTL(JSIOCGNAME(0))
+
 /* now things that need handlers */
 HANDLE_IOCTL(MEMREADOOB32, mtd_rw_oob)
 HANDLE_IOCTL(MEMWRITEOOB32, mtd_rw_oob)