TTY: tty_alloc_driver() returns error pointers

We changed these from alloc_tty_driver() to tty_alloc_driver() so the
error handling needs to modified to check for IS_ERR() instead of NULL.
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Acked-by: NJiri Slaby <jslaby@suse.cz>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/char/pcmcia/synclink_cs.c

@@ -2813,8 +2813,8 @@ static int __init synclink_cs_init(void)
 	serial_driver = tty_alloc_driver(MAX_DEVICE_COUNT,
 			TTY_DRIVER_REAL_RAW |
 			TTY_DRIVER_DYNAMIC_DEV);
-	if (!serial_driver) {
-		rc = -ENOMEM;
+	if (IS_ERR(serial_driver)) {
+		rc = PTR_ERR(serial_driver);
 		goto err;
 	}
 

drivers/char/ttyprintk.c

@@ -187,8 +187,8 @@ static int __init ttyprintk_init(void)
 			TTY_DRIVER_RESET_TERMIOS |
 			TTY_DRIVER_REAL_RAW |
 			TTY_DRIVER_UNNUMBERED_NODE);
-	if (!ttyprintk_driver)
-		return ret;
+	if (IS_ERR(ttyprintk_driver))
+		return PTR_ERR(ttyprintk_driver);
 
 	ttyprintk_driver->driver_name = "ttyprintk";
 	ttyprintk_driver->name = "ttyprintk";

drivers/tty/moxa.c

@@ -1048,8 +1048,8 @@ static int __init moxa_init(void)
 	moxaDriver = tty_alloc_driver(MAX_PORTS + 1,
 			TTY_DRIVER_REAL_RAW |
 			TTY_DRIVER_DYNAMIC_DEV);
-	if (!moxaDriver)
-		return -ENOMEM;
+	if (IS_ERR(moxaDriver))
+		return PTR_ERR(moxaDriver);
 
 	moxaDriver->name = "ttyMX";
 	moxaDriver->major = ttymajor;

drivers/tty/pty.c

@@ -448,14 +448,14 @@ static void __init legacy_pty_init(void)
 			TTY_DRIVER_RESET_TERMIOS |
 			TTY_DRIVER_REAL_RAW |
 			TTY_DRIVER_DYNAMIC_ALLOC);
-	if (!pty_driver)
+	if (IS_ERR(pty_driver))
 		panic("Couldn't allocate pty driver");
 
 	pty_slave_driver = tty_alloc_driver(legacy_count,
 			TTY_DRIVER_RESET_TERMIOS |
 			TTY_DRIVER_REAL_RAW |
 			TTY_DRIVER_DYNAMIC_ALLOC);
-	if (!pty_slave_driver)
+	if (IS_ERR(pty_slave_driver))
 		panic("Couldn't allocate pty slave driver");
 
 	pty_driver->driver_name = "pty_master";
@@ -682,7 +682,7 @@ static void __init unix98_pty_init(void)
 			TTY_DRIVER_DYNAMIC_DEV |
 			TTY_DRIVER_DEVPTS_MEM |
 			TTY_DRIVER_DYNAMIC_ALLOC);
-	if (!ptm_driver)
+	if (IS_ERR(ptm_driver))
 		panic("Couldn't allocate Unix98 ptm driver");
 	pts_driver = tty_alloc_driver(NR_UNIX98_PTY_MAX,
 			TTY_DRIVER_RESET_TERMIOS |
@@ -690,7 +690,7 @@ static void __init unix98_pty_init(void)
 			TTY_DRIVER_DYNAMIC_DEV |
 			TTY_DRIVER_DEVPTS_MEM |
 			TTY_DRIVER_DYNAMIC_ALLOC);
-	if (!pts_driver)
+	if (IS_ERR(pts_driver))
 		panic("Couldn't allocate Unix98 pts driver");
 
 	ptm_driver->driver_name = "pty_master";