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authorJohan Hovold <johan@kernel.org>2017-10-16 16:06:20 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-10-23 12:24:24 +0300
commit7c63838ea5afb15a60c58a2f0fe8ac093fc9f1a5 (patch)
tree016b86d163a99a714bfb2bfb5d5851161d93306b
parentdee7d0f3b200c67c6ee96bd37c6e8fa52690ab56 (diff)
downloadlinux-7c63838ea5afb15a60c58a2f0fe8ac093fc9f1a5.tar.xz
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>
-rw-r--r--drivers/tty/serdev/serdev-ttyport.c13
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)