diff options
| author | Johan Hovold <johan@kernel.org> | 2017-10-16 15:06:20 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-10-23 11:24:24 +0200 |
| commit | 7c63838ea5afb15a60c58a2f0fe8ac093fc9f1a5 (patch) | |
| tree | 016b86d163a99a714bfb2bfb5d5851161d93306b /drivers/tty/serdev | |
| parent | serdev: ttyport: enforce tty-driver open() requirement (diff) | |
| download | linux-7c63838ea5afb15a60c58a2f0fe8ac093fc9f1a5.tar.xz linux-7c63838ea5afb15a60c58a2f0fe8ac093fc9f1a5.zip | |
serdev: ttyport: add missing open() error handling
Add missing error handling for tty-driver open() which may fail (e.g. if
resource allocation fails or if a port is being disconnected).
Note that close() must be called also in case of failed open() and that
the operation sanity check is amended to catch buggy drivers.
Signed-off-by: Johan Hovold <johan@kernel.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serdev')
| -rw-r--r-- | drivers/tty/serdev/serdev-ttyport.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/drivers/tty/serdev/serdev-ttyport.c b/drivers/tty/serdev/serdev-ttyport.c index 404f3fd070a7..5b09ce920117 100644 --- a/drivers/tty/serdev/serdev-ttyport.c +++ b/drivers/tty/serdev/serdev-ttyport.c @@ -96,16 +96,21 @@ static int ttyport_open(struct serdev_controller *ctrl) struct serport *serport = serdev_controller_get_drvdata(ctrl); struct tty_struct *tty; struct ktermios ktermios; + int ret; tty = tty_init_dev(serport->tty_drv, serport->tty_idx); if (IS_ERR(tty)) return PTR_ERR(tty); serport->tty = tty; - if (!tty->ops->open) + if (!tty->ops->open || !tty->ops->close) { + ret = -ENODEV; goto err_unlock; + } - tty->ops->open(serport->tty, NULL); + ret = tty->ops->open(serport->tty, NULL); + if (ret) + goto err_close; /* Bring the UART into a known 8 bits no parity hw fc state */ ktermios = tty->termios; @@ -123,11 +128,13 @@ static int ttyport_open(struct serdev_controller *ctrl) tty_unlock(serport->tty); return 0; +err_close: + tty->ops->close(tty, NULL); err_unlock: tty_unlock(tty); tty_release_struct(tty, serport->tty_idx); - return -ENODEV; + return ret; } static void ttyport_close(struct serdev_controller *ctrl) |