[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 <[e-mail]>
Cc: Alessandro Zummo <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/char/genrtc.c

···
 	/* 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);