[PATCH] genrtc: fix read on 64-bit platforms

Fix genrtc's read() routine for 64-bit platforms.  Current gen_rtc_read()
stores 64bit integer and returns 8 even if an user tried to read a 32bit
integer.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/drivers/char/genrtc.c b/drivers/char/genrtc.c
index d3a2bc3..588fca5 100644 (file)
--- a/drivers/char/genrtc.c
+++ b/drivers/char/genrtc.c
@@ -200,13 +200,13 @@ static ssize_t gen_rtc_read(struct file *file, char __user *buf,
        /* first test allows optimizer to nuke this case for 32-bit machines */
        if (sizeof (int) != sizeof (long) && count == sizeof (unsigned int)) {
                unsigned int uidata = data;
-               retval = put_user(uidata, (unsigned long __user *)buf);
+               retval = put_user(uidata, (unsigned int __user *)buf) ?:
+                       sizeof(unsigned int);
        }
        else {
-               retval = put_user(data, (unsigned long __user *)buf);
+               retval = put_user(data, (unsigned long __user *)buf) ?:
+                       sizeof(unsigned long);
        }
-       if (!retval)
-               retval = sizeof(unsigned long);
  out:
        current->state = TASK_RUNNING;
        remove_wait_queue(&gen_rtc_wait, &wait);