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authorJohan Hovold <johan@kernel.org>2016-10-19 15:45:07 +0200
committerJohan Hovold <johan@kernel.org>2016-10-20 11:15:20 +0200
commitde24e0a108bc48062e1c7acaa97014bce32a919f (patch)
tree209a3d0ca8d086b39060cd38890acdd16c516e33 /drivers/usb/serial
parentca006f785fbfd7a5c901900bd3fe2b26e946a1ee (diff)
USB: serial: cp210x: fix tiocmget error handling
The current tiocmget implementation would fail to report errors up the stack and instead leaked a few bits from the stack as a mask of modem-status flags. Fixes: 39a66b8d22a3 ("[PATCH] USB: CP2101 Add support for flow control") Cc: stable <stable@vger.kernel.org> Signed-off-by: Johan Hovold <johan@kernel.org>
Diffstat (limited to 'drivers/usb/serial')
-rw-r--r--drivers/usb/serial/cp210x.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
index 54a4de0efdba..f61477bed3a8 100644
--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@@ -1077,7 +1077,9 @@ static int cp210x_tiocmget(struct tty_struct *tty)
u8 control;
int result;
- cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
+ result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
+ if (result)
+ return result;
result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
|((control & CONTROL_RTS) ? TIOCM_RTS : 0)