From: Johan Hovold <johan@xxxxxxxxxx>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
commit de24e0a108bc48062e1c7acaa97014bce32a919f upstream.
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")
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
drivers/usb/serial/cp210x.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
index f5e4fda7f902..188e50446514 100644
--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@@ -919,7 +919,9 @@ static int cp210x_tiocmget(struct tty_struct *tty)
unsigned int control;
int result;
- cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1);
+ result = cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1);
+ if (result)
+ return result;
result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
|((control & CONTROL_RTS) ? TIOCM_RTS : 0)
--
2.10.2
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