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: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 4 insertions, 4 deletions

diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
index f5a27c66ff60..2bace847eb39 100644
--- a/drivers/tty/pty.c
+++ b/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";