[PATCH 73/80] tty: Remove lots of NULL checks

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From: Alan Cox

Subject: [PATCH 73/80] tty: Remove lots of NULL checks

Date: Monday, October 13, 2008 - 2:44 am

From: Alan Cox <alan@redhat.com>

Many tty drivers contain 'can't happen' checks against NULL pointers passed
in by the tty layer. These have never been possible to occur. Even more
importantly if they ever do occur we want to know as it would be a serious
bug.

Signed-off-by: Alan Cox <alan@redhat.com>
---

 drivers/char/amiserial.c      |    6 ------
 drivers/char/generic_serial.c |   21 ---------------------
 drivers/char/istallion.c      |    6 ------
 drivers/char/mxser.c          |    5 -----
 drivers/char/n_r3964.c        |    8 +-------
 drivers/char/stallion.c       |   34 ----------------------------------
 6 files changed, 1 insertions(+), 79 deletions(-)


diff --git a/drivers/char/amiserial.c b/drivers/char/amiserial.c
index 6e763e3..98821f9 100644
--- a/drivers/char/amiserial.c
+++ b/drivers/char/amiserial.c
@@ -837,9 +837,6 @@ static int rs_put_char(struct tty_struct *tty, unsigned char ch)
 	struct async_struct *info;
 	unsigned long flags;
 
-	if (!tty)
-		return 0;
-
 	info = tty->driver_data;
 
 	if (serial_paranoia_check(info, tty->name, "rs_put_char"))
@@ -892,9 +889,6 @@ static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count
 	struct async_struct *info;
 	unsigned long flags;
 
-	if (!tty)
-		return 0;
-
 	info = tty->driver_data;
 
 	if (serial_paranoia_check(info, tty->name, "rs_write"))
diff --git a/drivers/char/generic_serial.c b/drivers/char/generic_serial.c
index 19d3afb..c6090f8 100644
--- a/drivers/char/generic_serial.c
+++ b/drivers/char/generic_serial.c
@@ -54,8 +54,6 @@ int gs_put_char(struct tty_struct * tty, unsigned char ch)
 
 	func_enter (); 
 
-	if (!tty) return 0;
-
 	port = tty->driver_data;
 
 	if (!port) return 0;
@@ -97,8 +95,6 @@ int gs_write(struct tty_struct * tty,
 
 	func_enter ();
 
-	if (!tty) return 0;
-
 	port = tty->driver_data;
 
 	if (!port) return 0;
@@ -185,7 +181,6 @@ static int gs_real_chars_in_buffer(struct tty_struct *tty)
 	struct gs_port *port;
 	func_enter ();
 
-	if (!tty) return 0;
 	port = tty->driver_data;
 
 	if (!port->rd) return 0;
@@ -274,8 +269,6 @@ void gs_flush_buffer(struct tty_struct *tty)
 
 	func_enter ();
 
-	if (!tty) return;
-
 	port = tty->driver_data;
 
 	if (!port) return;
@@ -296,8 +289,6 @@ void gs_flush_chars(struct tty_struct * tty)
 
 	func_enter ();
 
-	if (!tty) return;
-
 	port = tty->driver_data;
 
 	if (!port) return;
@@ -321,8 +312,6 @@ void gs_stop(struct tty_struct * tty)
 
 	func_enter ();
 
-	if (!tty) return;
-
 	port = tty->driver_data;
 
 	if (!port) return;
@@ -341,8 +330,6 @@ void gs_start(struct tty_struct * tty)
 {
 	struct gs_port *port;
 
-	if (!tty) return;
-
 	port = tty->driver_data;
 
 	if (!port) return;
@@ -393,8 +380,6 @@ void gs_hangup(struct tty_struct *tty)
 
 	func_enter ();
 
-	if (!tty) return;
-
 	port = tty->driver_data;
 	tty = port->port.tty;
 	if (!tty) 
@@ -426,8 +411,6 @@ int gs_block_til_ready(void *port_, struct file * filp)
 
 	tty = port->port.tty;
 
-	if (!tty) return 0;
-
 	gs_dprintk (GS_DEBUG_BTR, "Entering gs_block_till_ready.\n"); 
 	/*
 	 * If the device is in the middle of being closed, then block
@@ -523,8 +506,6 @@ void gs_close(struct tty_struct * tty, struct file * filp)
 	
 	func_enter ();
 
-	if (!tty) return;
-
 	port = (struct gs_port *) tty->driver_data;
 
 	if (!port) return;
@@ -621,8 +602,6 @@ void gs_set_termios (struct tty_struct * tty,
 
 	func_enter();
 
-	if (!tty) return;
-
 	port = tty->driver_data;
 
 	if (!port) return;
diff --git a/drivers/char/istallion.c b/drivers/char/istallion.c
index 96ee112..505d7a1 100644
--- a/drivers/char/istallion.c
+++ b/drivers/char/istallion.c
@@ -1375,8 +1375,6 @@ static void stli_flushchars(struct tty_struct *tty)
 	stli_txcookrealsize = 0;
 	stli_txcooktty = NULL;
 
-	if (tty == NULL)
-		return;
 	if (cooktty == NULL)
 		return;
 	if (tty != cooktty)
@@ -1732,8 +1730,6 @@ static void stli_settermios(struct tty_struct *tty, struct ktermios *old)
 	struct ktermios *tiosp;
 	asyport_t aport;
 
-	if (tty == NULL)
-		return;
 	portp = tty->driver_data;
 	if (portp == NULL)
 		return;
@@ -1938,8 +1934,6 @@ static void stli_waituntilsent(struct tty_struct *tty, int timeout)
 	struct stliport *portp;
 	unsigned long tend;
 
-	if (tty == NULL)
-		return;
 	portp = tty->driver_data;
 	if (portp == NULL)
 		return;
diff --git a/drivers/char/mxser.c b/drivers/char/mxser.c
index 308cb60..8beef50 100644
--- a/drivers/char/mxser.c
+++ b/drivers/char/mxser.c
@@ -616,9 +616,6 @@ static int mxser_set_baud(struct tty_struct *tty, long newspd)
 	int quot = 0, baud;
 	unsigned char cval;
 
-	if (!tty->termios)
-		return -1;
-
 	if (!info->ioaddr)
 		return -1;
 
@@ -688,8 +685,6 @@ static int mxser_change_speed(struct tty_struct *tty,
 	int ret = 0;
 	unsigned char status;
 
-	if (!tty->termios)
-		return ret;
 	cflag = tty->termios->c_cflag;
 	if (!info->ioaddr)
 		return ret;
diff --git a/drivers/char/n_r3964.c b/drivers/char/n_r3964.c
index ae377aa..4a8215a 100644
--- a/drivers/char/n_r3964.c
+++ b/drivers/char/n_r3964.c
@@ -372,14 +372,8 @@ static void remove_from_rx_queue(struct r3964_info *pInfo,
 static void put_char(struct r3964_info *pInfo, unsigned char ch)
 {
 	struct tty_struct *tty = pInfo->tty;
-
-	if (tty == NULL)
-		return;
-
 	/* FIXME: put_char should not be called from an IRQ */
-	if (tty->ops->put_char) {
-		tty->ops->put_char(tty, ch);
-	}
+	tty_put_char(tty, ch);
 	pInfo->bcc ^= ch;
 }
 
diff --git a/drivers/char/stallion.c b/drivers/char/stallion.c
index 81b3234..8b8f07a 100644
--- a/drivers/char/stallion.c
+++ b/drivers/char/stallion.c
@@ -849,8 +849,6 @@ static void stl_flushbuffer(struct tty_struct *tty)
 
 	pr_debug("stl_flushbuffer(tty=%p)\n", tty);
 
-	if (tty == NULL)
-		return;
 	portp = tty->driver_data;
 	if (portp == NULL)
 		return;
@@ -868,8 +866,6 @@ static void stl_waituntilsent(struct tty_struct *tty, int timeout)
 
 	pr_debug("stl_waituntilsent(tty=%p,timeout=%d)\n", tty, timeout);
 
-	if (tty == NULL)
-		return;
 	portp = tty->driver_data;
 	if (portp == NULL)
 		return;
@@ -1036,8 +1032,6 @@ static int stl_putchar(struct tty_struct *tty, unsigned char ch)
 
 	pr_debug("stl_putchar(tty=%p,ch=%x)\n", tty, ch);
 
-	if (tty == NULL)
-		return -EINVAL;
 	portp = tty->driver_data;
 	if (portp == NULL)
 		return -EINVAL;
@@ -1073,8 +1067,6 @@ static void stl_flushchars(struct tty_struct *tty)
 
 	pr_debug("stl_flushchars(tty=%p)\n", tty);
 
-	if (tty == NULL)
-		return;
 	portp = tty->driver_data;
 	if (portp == NULL)
 		return;
@@ -1093,8 +1085,6 @@ static int stl_writeroom(struct tty_struct *tty)
 
 	pr_debug("stl_writeroom(tty=%p)\n", tty);
 
-	if (tty == NULL)
-		return 0;
 	portp = tty->driver_data;
 	if (portp == NULL)
 		return 0;
@@ -1125,8 +1115,6 @@ static int stl_charsinbuffer(struct tty_struct *tty)
 
 	pr_debug("stl_charsinbuffer(tty=%p)\n", tty);
 
-	if (tty == NULL)
-		return 0;
 	portp = tty->driver_data;
 	if (portp == NULL)
 		return 0;
@@ -1219,8 +1207,6 @@ static int stl_tiocmget(struct tty_struct *tty, struct file *file)
 {
 	struct stlport	*portp;
 
-	if (tty == NULL)
-		return -ENODEV;
 	portp = tty->driver_data;
 	if (portp == NULL)
 		return -ENODEV;
@@ -1236,8 +1222,6 @@ static int stl_tiocmset(struct tty_struct *tty, struct file *file,
 	struct stlport	*portp;
 	int rts = -1, dtr = -1;
 
-	if (tty == NULL)
-		return -ENODEV;
 	portp = tty->driver_data;
 	if (portp == NULL)
 		return -ENODEV;
@@ -1266,8 +1250,6 @@ static int stl_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd
 	pr_debug("stl_ioctl(tty=%p,file=%p,cmd=%x,arg=%lx)\n", tty, file, cmd,
 			arg);
 
-	if (tty == NULL)
-		return -ENODEV;
 	portp = tty->driver_data;
 	if (portp == NULL)
 		return -ENODEV;
@@ -1321,8 +1303,6 @@ static void stl_start(struct tty_struct *tty)
 
 	pr_debug("stl_start(tty=%p)\n", tty);
 
-	if (tty == NULL)
-		return;
 	portp = tty->driver_data;
 	if (portp == NULL)
 		return;
@@ -1338,8 +1318,6 @@ static void stl_settermios(struct tty_struct *tty, struct ktermios *old)
 
 	pr_debug("stl_settermios(tty=%p,old=%p)\n", tty, old);
 
-	if (tty == NULL)
-		return;
 	portp = tty->driver_data;
 	if (portp == NULL)
 		return;
@@ -1373,8 +1351,6 @@ static void stl_throttle(struct tty_struct *tty)
 
 	pr_debug("stl_throttle(tty=%p)\n", tty);
 
-	if (tty == NULL)
-		return;
 	portp = tty->driver_data;
 	if (portp == NULL)
 		return;
@@ -1393,8 +1369,6 @@ static void stl_unthrottle(struct tty_struct *tty)
 
 	pr_debug("stl_unthrottle(tty=%p)\n", tty);
 
-	if (tty == NULL)
-		return;
 	portp = tty->driver_data;
 	if (portp == NULL)
 		return;
@@ -1414,8 +1388,6 @@ static void stl_stop(struct tty_struct *tty)
 
 	pr_debug("stl_stop(tty=%p)\n", tty);
 
-	if (tty == NULL)
-		return;
 	portp = tty->driver_data;
 	if (portp == NULL)
 		return;
@@ -1436,8 +1408,6 @@ static void stl_hangup(struct tty_struct *tty)
 
 	pr_debug("stl_hangup(tty=%p)\n", tty);
 
-	if (tty == NULL)
-		return;
 	portp = tty->driver_data;
 	if (portp == NULL)
 		return;
@@ -1470,8 +1440,6 @@ static int stl_breakctl(struct tty_struct *tty, int state)
 
 	pr_debug("stl_breakctl(tty=%p,state=%d)\n", tty, state);
 
-	if (tty == NULL)
-		return -EINVAL;
 	portp = tty->driver_data;
 	if (portp == NULL)
 		return -EINVAL;
@@ -1488,8 +1456,6 @@ static void stl_sendxchar(struct tty_struct *tty, char ch)
 
 	pr_debug("stl_sendxchar(tty=%p,ch=%x)\n", tty, ch);
 
-	if (tty == NULL)
-		return;
 	portp = tty->driver_data;
 	if (portp == NULL)
 		return;

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Messages in current thread:

[PATCH 00/80] TTY updates for 2.6.28, Alan Cox, (Mon Oct 13, 2:31 am)

[PATCH 01/80] drivers/serial/crisv10.c: add missing put_tt ..., Alan Cox, (Mon Oct 13, 2:31 am)

[PATCH 02/80] drivers/char/hvc_console.c: adjust call to p ..., Alan Cox, (Mon Oct 13, 2:31 am)

[PATCH 03/80] coldfire: scheduled SERIAL_COLDFIRE removal, Alan Cox, (Mon Oct 13, 2:31 am)

[PATCH 04/80] epca: call tty_port_init, Alan Cox, (Mon Oct 13, 2:32 am)

[PATCH 05/80] Blackfin Serial Driver: use __initdata for d ..., Alan Cox, (Mon Oct 13, 2:32 am)

[PATCH 06/80] Blackfin Serial Driver: Fix bug - should sus ..., Alan Cox, (Mon Oct 13, 2:32 am)

[PATCH 07/80] Blackfin Serial Driver: trim trailing whites ..., Alan Cox, (Mon Oct 13, 2:33 am)

[PATCH 08/80] Blackfin Serial Driver: move common variable ..., Alan Cox, (Mon Oct 13, 2:33 am)

[PATCH 09/80] Blackfin Serial Driver: Remove useless stop, Alan Cox, (Mon Oct 13, 2:33 am)

[PATCH 10/80] Blackfin Serial Driver: Fix bug - Don't call ..., Alan Cox, (Mon Oct 13, 2:33 am)

[PATCH 11/80] Blackfin Serial Driver: Fix bug - ircp fails ..., Alan Cox, (Mon Oct 13, 2:33 am)

[PATCH 12/80] Blackfin Serial Driver: Fix bug - request UA ..., Alan Cox, (Mon Oct 13, 2:33 am)

[PATCH 13/80] Fix oti6858 debug level, Alan Cox, (Mon Oct 13, 2:34 am)

[PATCH 14/80] Char: cyclades. remove bogus iomap, Alan Cox, (Mon Oct 13, 2:34 am)

[PATCH 15/80] Char: sx, fix io unmapping, Alan Cox, (Mon Oct 13, 2:34 am)

[PATCH 16/80] Char: merge ip2main and ip2base, Alan Cox, (Mon Oct 13, 2:34 am)

[PATCH 17/80] ip2, cleanup globals, Alan Cox, (Mon Oct 13, 2:34 am)

[PATCH 18/80] ip2, fix sparse warnings, Alan Cox, (Mon Oct 13, 2:34 am)

[PATCH 19/80] ip2, init/deinit cleanup, Alan Cox, (Mon Oct 13, 2:34 am)

[PATCH 20/80] ip2: avoid add_timer with pending timer, Alan Cox, (Mon Oct 13, 2:35 am)

[PATCH 21/80] audit: Handle embedded NUL in TTY input auditing, Alan Cox, (Mon Oct 13, 2:35 am)

[PATCH 22/80] serial: Make uart_port's ioport "unsigned long"., Alan Cox, (Mon Oct 13, 2:35 am)

[PATCH 23/80] nozomi: Fix close on error, Alan Cox, (Mon Oct 13, 2:35 am)

[PATCH 24/80] serial-make-uart_ports-ioport-unsigned-long-fix, Alan Cox, (Mon Oct 13, 2:35 am)

[PATCH 25/80] usb: fix pl2303 initialization, Alan Cox, (Mon Oct 13, 2:35 am)

[PATCH 26/80] ftdi: A few errors are err() that should be ..., Alan Cox, (Mon Oct 13, 2:36 am)

[PATCH 27/80] serial_8250: pci_enable_device fail is not f ..., Alan Cox, (Mon Oct 13, 2:36 am)

[PATCH 28/80] 8250: remove a few inlines of dubious value, Alan Cox, (Mon Oct 13, 2:36 am)

[PATCH 29/80] serial: allow 8250 to be used on sparc, Alan Cox, (Mon Oct 13, 2:36 am)

[PATCH 30/80] tty: move tioclinux from a special case, Alan Cox, (Mon Oct 13, 2:36 am)

[PATCH 31/80] uml: small cleanups and note bugs to be deal ..., Alan Cox, (Mon Oct 13, 2:36 am)

[PATCH 32/80] tty: split the buffering from tty_io, Alan Cox, (Mon Oct 13, 2:36 am)

[PATCH 33/80] tty: Split tty_port into its own file, Alan Cox, (Mon Oct 13, 2:37 am)

[PATCH 34/80] pps: Reserve a line discipline number for PPS, Alan Cox, (Mon Oct 13, 2:37 am)

[PATCH 35/80] tty: Add a kref count, Alan Cox, (Mon Oct 13, 2:37 am)

[PATCH 36/80] tty: use krefs to protect driver module counts, Alan Cox, (Mon Oct 13, 2:37 am)

[PATCH 37/80] tty: Cris has a nice RS485 ioctl so we shoul ..., Alan Cox, (Mon Oct 13, 2:37 am)

[PATCH 38/80] tty: ipw need reworking, Alan Cox, (Mon Oct 13, 2:38 am)

[PATCH 39/80] tty: Add termiox, Alan Cox, (Mon Oct 13, 2:38 am)

[PATCH 40/80] tty: Termios locking - sort out real_tty con ..., Alan Cox, (Mon Oct 13, 2:38 am)

[PATCH 41/80] tty: compare the tty winsize, Alan Cox, (Mon Oct 13, 2:39 am)

[PATCH 42/80] tty: Make get_current_tty use a kref, Alan Cox, (Mon Oct 13, 2:39 am)

[PATCH 43/80] tty: Move tty_write_message out of kernel/printk, Alan Cox, (Mon Oct 13, 2:39 am)

[PATCH 44/80] tty: usb-serial krefs, Alan Cox, (Mon Oct 13, 2:39 am)

[PATCH 45/80] tty: kref usage for isicom and moxa, Alan Cox, (Mon Oct 13, 2:39 am)

[PATCH 46/80] stallion: Use krefs, Alan Cox, (Mon Oct 13, 2:40 am)

[PATCH 47/80] mxser: Switch to kref tty, Alan Cox, (Mon Oct 13, 2:40 am)

[PATCH 48/80] tty: the vhangup syscall is racy, Alan Cox, (Mon Oct 13, 2:40 am)

[PATCH 49/80] tty: Redo current tty locking, Alan Cox, (Mon Oct 13, 2:40 am)

[PATCH 50/80] tty: Fix abusers of current->sighand->tty, Alan Cox, (Mon Oct 13, 2:40 am)

[PATCH 51/80] pty: If the administrator creates a device f ..., Alan Cox, (Mon Oct 13, 2:41 am)

[PATCH 52/80] vt: remove bogus lock dropping, Alan Cox, (Mon Oct 13, 2:41 am)

[PATCH 53/80] tty: shutdown method, Alan Cox, (Mon Oct 13, 2:41 am)

[PATCH 54/80] tty: Remove more special casing and out of p ..., Alan Cox, (Mon Oct 13, 2:41 am)

[PATCH 55/80] tty: Move parts of tty_init_dev into new fun ..., Alan Cox, (Mon Oct 13, 2:41 am)

[PATCH 56/80] tty: Clean up the tty_init_dev changes further, Alan Cox, (Mon Oct 13, 2:42 am)

[PATCH 57/80] tty: kref the tty driver object, Alan Cox, (Mon Oct 13, 2:42 am)

[PATCH 58/80] tty: More driver operations, Alan Cox, (Mon Oct 13, 2:42 am)

[PATCH 59/80] tty: Finish fixing up the init_dev interface ..., Alan Cox, (Mon Oct 13, 2:42 am)

[PATCH 60/80] tty: extract the pty init time special cases, Alan Cox, (Mon Oct 13, 2:42 am)

[PATCH 61/80] Move tty lookup/reopen to caller, Alan Cox, (Mon Oct 13, 2:42 am)

[PATCH 62/80] Add an instance parameter devpts interfaces, Alan Cox, (Mon Oct 13, 2:42 am)

[PATCH 63/80] Simplify devpts_get_tty(), Alan Cox, (Mon Oct 13, 2:43 am)

[PATCH 64/80] Simplify devpts_pty_new(), Alan Cox, (Mon Oct 13, 2:43 am)

[PATCH 65/80] Simplify devpts_pty_kill, Alan Cox, (Mon Oct 13, 2:43 am)

[PATCH 66/80] pty: Coding style and polish, Alan Cox, (Mon Oct 13, 2:43 am)

[PATCH 67/80] pty: Fix allocation failure double free, Alan Cox, (Mon Oct 13, 2:43 am)

[PATCH 68/80] pty: simplify unix98 allocation, Alan Cox, (Mon Oct 13, 2:43 am)

[PATCH 69/80] tty: simplify ktermios allocation, Alan Cox, (Mon Oct 13, 2:44 am)

[PATCH 70/80] tty: some ICANON magic is in the wrong places, Alan Cox, (Mon Oct 13, 2:44 am)

[PATCH 71/80] tty: Fallout from tty-move-canon-specials, Alan Cox, (Mon Oct 13, 2:44 am)

[PATCH 72/80] tty: fix up gigaset a bit, Alan Cox, (Mon Oct 13, 2:44 am)

[PATCH 73/80] tty: Remove lots of NULL checks, Alan Cox, (Mon Oct 13, 2:44 am)

[PATCH 74/80] tty: Minor tidyups and document fixes for n_tty, Alan Cox, (Mon Oct 13, 2:45 am)

[PATCH 75/80] applicom: Fix an unchecked user ioctl range ..., Alan Cox, (Mon Oct 13, 2:45 am)

[PATCH 76/80] serial: fix device name reporting when minor ..., Alan Cox, (Mon Oct 13, 2:45 am)

[PATCH 77/80] tty: tty_io.c shadows sparse fix, Alan Cox, (Mon Oct 13, 2:45 am)

[PATCH 78/80] fs3270: remove extra locks, Alan Cox, (Mon Oct 13, 2:45 am)

[PATCH 79/80] fs3270: Correct error returns, Alan Cox, (Mon Oct 13, 2:46 am)

[PATCH 80/80] tty: rename the remaining oddly named n_tty ..., Alan Cox, (Mon Oct 13, 2:46 am)

Re: [PATCH 72/80] tty: fix up gigaset a bit, Tilman Schmidt, (Thu Oct 16, 8:50 am)

Re: [PATCH 72/80] tty: fix up gigaset a bit, Alan Cox, (Fri Oct 17, 4:40 am)

Re: [PATCH 72/80] tty: fix up gigaset a bit, Tilman Schmidt, (Sun Oct 19, 5:28 am)

Re: [PATCH 72/80] tty: fix up gigaset a bit, Alan Cox, (Wed Oct 22, 2:00 am)

Re: [PATCH 72/80] tty: fix up gigaset a bit, Tilman Schmidt, (Fri Oct 24, 4:21 am)


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