move compat handling of tty ioctls to tty_compat_ioctl()

ioctls that are
	* callable only via tty_ioctl()
	* not driver-specific
	* not demand data structure conversions
	* either always need passing arg as is or always demand compat_ptr()
get intercepted in tty_compat_ioctl() from the very beginning and
redirecter to tty_ioctl().  As the result, their entries in fs/compat_ioctl.c
(some of those had been missing, BTW) got removed, as well as
n_tty_compat_ioctl_helper() (now it's never called with any cmd it would accept).

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

drivers/tty/tty_io.c

@@ -97,6 +97,7 @@
 #include <linux/seq_file.h>
 #include <linux/serial.h>
 #include <linux/ratelimit.h>
+#include <linux/compat.h>
 
 #include <linux/uaccess.h>
 
@@ -2668,6 +2669,81 @@ static long tty_compat_ioctl(struct file *file, unsigned int cmd,
 	struct tty_ldisc *ld;
 	int retval = -ENOIOCTLCMD;
 
+	switch (cmd) {
+	case TIOCSTI:
+	case TIOCGWINSZ:
+	case TIOCSWINSZ:
+	case TIOCGEXCL:
+	case TIOCGETD:
+	case TIOCSETD:
+	case TIOCGDEV:
+	case TIOCMGET:
+	case TIOCMSET:
+	case TIOCMBIC:
+	case TIOCMBIS:
+	case TIOCGICOUNT:
+	case TIOCGPGRP:
+	case TIOCSPGRP:
+	case TIOCGSID:
+	case TIOCSERGETLSR:
+	case TIOCGRS485:
+	case TIOCSRS485:
+#ifdef TIOCGETP
+	case TIOCGETP:
+	case TIOCSETP:
+	case TIOCSETN:
+#endif
+#ifdef TIOCGETC
+	case TIOCGETC:
+	case TIOCSETC:
+#endif
+#ifdef TIOCGLTC
+	case TIOCGLTC:
+	case TIOCSLTC:
+#endif
+	case TCSETSF:
+	case TCSETSW:
+	case TCSETS:
+	case TCGETS:
+#ifdef TCGETS2
+	case TCGETS2:
+	case TCSETSF2:
+	case TCSETSW2:
+	case TCSETS2:
+#endif
+	case TCGETA:
+	case TCSETAF:
+	case TCSETAW:
+	case TCSETA:
+	case TIOCGLCKTRMIOS:
+	case TIOCSLCKTRMIOS:
+#ifdef TCGETX
+	case TCGETX:
+	case TCSETX:
+	case TCSETXW:
+	case TCSETXF:
+#endif
+	case TIOCGSOFTCAR:
+	case TIOCSSOFTCAR:
+		return tty_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
+	case TIOCCONS:
+	case TIOCEXCL:
+	case TIOCNXCL:
+	case TIOCVHANGUP:
+	case TIOCSBRK:
+	case TIOCCBRK:
+	case TCSBRK:
+	case TCSBRKP:
+	case TCFLSH:
+	case TIOCGPTPEER:
+	case TIOCNOTTY:
+	case TIOCSCTTY:
+	case TCXONC:
+	case TIOCMIWAIT:
+	case TIOCSERCONFIG:
+		return tty_ioctl(file, cmd, arg);
+	}
+
 	if (tty_paranoia_check(tty, file_inode(file), "tty_ioctl"))
 		return -EINVAL;
 
@@ -2682,8 +2758,6 @@ static long tty_compat_ioctl(struct file *file, unsigned int cmd,
 		return hung_up_tty_compat_ioctl(file, cmd, arg);
 	if (ld->ops->compat_ioctl)
 		retval = ld->ops->compat_ioctl(tty, file, cmd, arg);
-	else
-		retval = n_tty_compat_ioctl_helper(tty, file, cmd, arg);
 	tty_ldisc_deref(ld);
 
 	return retval;

drivers/tty/tty_ioctl.c

@@ -941,19 +941,3 @@ int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
 	}
 }
 EXPORT_SYMBOL(n_tty_ioctl_helper);
-
-#ifdef CONFIG_COMPAT
-long n_tty_compat_ioctl_helper(struct tty_struct *tty, struct file *file,
-					unsigned int cmd, unsigned long arg)
-{
-	switch (cmd) {
-	case TIOCGLCKTRMIOS:
-	case TIOCSLCKTRMIOS:
-		return tty_mode_ioctl(tty, file, cmd, (unsigned long) compat_ptr(arg));
-	default:
-		return -ENOIOCTLCMD;
-	}
-}
-EXPORT_SYMBOL(n_tty_compat_ioctl_helper);
-#endif
-

fs/compat_ioctl.c

@@ -711,52 +711,9 @@ COMPATIBLE_IOCTL(0x4B50)   /* KDGHWCLK - not in the kernel, but don't complain *
 COMPATIBLE_IOCTL(0x4B51)   /* KDSHWCLK - not in the kernel, but don't complain */
 
 /* Big T */
-COMPATIBLE_IOCTL(TCGETA)
-COMPATIBLE_IOCTL(TCSETA)
-COMPATIBLE_IOCTL(TCSETAW)
-COMPATIBLE_IOCTL(TCSETAF)
-COMPATIBLE_IOCTL(TCSBRK)
-COMPATIBLE_IOCTL(TCXONC)
-COMPATIBLE_IOCTL(TCFLSH)
-COMPATIBLE_IOCTL(TCGETS)
-COMPATIBLE_IOCTL(TCSETS)
-COMPATIBLE_IOCTL(TCSETSW)
-COMPATIBLE_IOCTL(TCSETSF)
 COMPATIBLE_IOCTL(TIOCLINUX)
-COMPATIBLE_IOCTL(TIOCSBRK)
-COMPATIBLE_IOCTL(TIOCGDEV)
-COMPATIBLE_IOCTL(TIOCCBRK)
-COMPATIBLE_IOCTL(TIOCGSID)
-COMPATIBLE_IOCTL(TIOCGICOUNT)
-COMPATIBLE_IOCTL(TIOCGEXCL)
 /* Little t */
-COMPATIBLE_IOCTL(TIOCGETD)
-COMPATIBLE_IOCTL(TIOCSETD)
-COMPATIBLE_IOCTL(TIOCEXCL)
-COMPATIBLE_IOCTL(TIOCNXCL)
-COMPATIBLE_IOCTL(TIOCCONS)
-COMPATIBLE_IOCTL(TIOCGSOFTCAR)
-COMPATIBLE_IOCTL(TIOCSSOFTCAR)
-COMPATIBLE_IOCTL(TIOCSWINSZ)
-COMPATIBLE_IOCTL(TIOCGWINSZ)
-COMPATIBLE_IOCTL(TIOCMGET)
-COMPATIBLE_IOCTL(TIOCMBIC)
-COMPATIBLE_IOCTL(TIOCMBIS)
-COMPATIBLE_IOCTL(TIOCMSET)
-COMPATIBLE_IOCTL(TIOCNOTTY)
-COMPATIBLE_IOCTL(TIOCSTI)
 COMPATIBLE_IOCTL(TIOCOUTQ)
-COMPATIBLE_IOCTL(TIOCSPGRP)
-COMPATIBLE_IOCTL(TIOCGPGRP)
-COMPATIBLE_IOCTL(TIOCSERGETLSR)
-COMPATIBLE_IOCTL(TIOCSRS485)
-COMPATIBLE_IOCTL(TIOCGRS485)
-#ifdef TCGETS2
-COMPATIBLE_IOCTL(TCGETS2)
-COMPATIBLE_IOCTL(TCSETS2)
-COMPATIBLE_IOCTL(TCSETSW2)
-COMPATIBLE_IOCTL(TCSETSF2)
-#endif
 /* Little f */
 COMPATIBLE_IOCTL(FIOCLEX)
 COMPATIBLE_IOCTL(FIONCLEX)
@@ -1219,10 +1176,6 @@ COMPATIBLE_IOCTL(JSIOCGAXES)
 COMPATIBLE_IOCTL(JSIOCGBUTTONS)
 COMPATIBLE_IOCTL(JSIOCGNAME(0))
 
-#ifdef TIOCGLTC
-COMPATIBLE_IOCTL(TIOCGLTC)
-COMPATIBLE_IOCTL(TIOCSLTC)
-#endif
 #ifdef TIOCSTART
 /*
  * For these two we have definitions in ioctls.h and/or termios.h on
@@ -1312,10 +1265,6 @@ static long do_ioctl_trans(unsigned int cmd,
 	 * so we must not do a compat_ptr() translation.
 	 */
 	switch (cmd) {
-	/* Big T */
-	case TCSBRKP:
-	case TIOCMIWAIT:
-	case TIOCSCTTY:
 	/* RAID */
 	case HOT_REMOVE_DISK:
 	case HOT_ADD_DISK:

include/linux/tty.h

@@ -746,8 +746,6 @@ static inline int tty_audit_push(void)
 /* tty_ioctl.c */
 extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
 		       unsigned int cmd, unsigned long arg);
-extern long n_tty_compat_ioctl_helper(struct tty_struct *tty, struct file *file,
-		       unsigned int cmd, unsigned long arg);
 
 /* vt.c */