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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: 39a66b8d22 ("[PATCH] USB: CP2101 Add support for flow control")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Johan Hovold 2016-10-19 15:45:07 +02:00
parent ca006f785f
commit de24e0a108
1 changed files with 3 additions and 1 deletions
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4
drivers/usb/serial/cp210x.c
View File

@ -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)