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USB: serial: kobil_sct: fix modem-status error handling

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[ Upstream commit a420b5d939ee58f1d950f0ea782834056520aeaa ]

Make sure to return -EIO in case of a short modem-status read request.

While at it, split the debug message to not include the (zeroed)
transfer-buffer content in case of errors.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2018-07-04 17:02:18 +02:00 committed by Greg Kroah-Hartman
parent 90de5688af
commit 410534a343
1 changed files with 10 additions and 2 deletions
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12
drivers/usb/serial/kobil_sct.c
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@ -397,12 +397,20 @@ static int kobil_tiocmget(struct tty_struct *tty)
transfer_buffer_length,
KOBIL_TIMEOUT);
dev_dbg(&port->dev, "%s - Send get_status_line_state URB returns: %i. Statusline: %02x\n",
__func__, result, transfer_buffer[0]);
dev_dbg(&port->dev, "Send get_status_line_state URB returns: %i\n",
result);
if (result < 1) {
if (result >= 0)
result = -EIO;
goto out_free;
}
dev_dbg(&port->dev, "Statusline: %02x\n", transfer_buffer[0]);
result = 0;
if ((transfer_buffer[0] & SUSBCR_GSL_DSR) != 0)
result = TIOCM_DSR;
out_free:
kfree(transfer_buffer);
return result;
}