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USB: pl2303: add error handling to line requests 

Refactor and add error handling to line requests.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2013-12-29 19:23:03 +01:00 committed by Greg Kroah-Hartman
parent a6ec8245bf
commit 383d19c587
1 changed files with 51 additions and 17 deletions
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68
drivers/usb/serial/pl2303.c
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@ -344,6 +344,52 @@ static void pl2303_encode_baudrate(struct tty_struct *tty,
dev_dbg(&port->dev, "baud set = %d\n", baud);
}
static int pl2303_get_line_request(struct usb_serial_port *port,
unsigned char buf[7])
{
struct usb_device *udev = port->serial->dev;
int ret;
ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
0, 0, buf, 7, 100);
if (ret != 7) {
dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
if (ret > 0)
ret = -EIO;
return ret;
}
dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
return 0;
}
static int pl2303_set_line_request(struct usb_serial_port *port,
unsigned char buf[7])
{
struct usb_device *udev = port->serial->dev;
int ret;
ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
0, 0, buf, 7, 100);
if (ret != 7) {
dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
if (ret > 0)
ret = -EIO;
return ret;
}
dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
return 0;
}
static void pl2303_set_termios(struct tty_struct *tty,
struct usb_serial_port *port, struct ktermios *old_termios)
{
@ -352,7 +398,7 @@ static void pl2303_set_termios(struct tty_struct *tty,
struct pl2303_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
unsigned char *buf;
int i;
int ret;
u8 control;
if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
@ -366,10 +412,7 @@ static void pl2303_set_termios(struct tty_struct *tty,
return;
}
i = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
0, 0, buf, 7, 100);
dev_dbg(&port->dev, "0xa1:0x21:0:0 %d - %7ph\n", i, buf);
pl2303_get_line_request(port, buf);
switch (C_CSIZE(tty)) {
case CS5:
@ -451,14 +494,8 @@ static void pl2303_set_termios(struct tty_struct *tty,
* only used in set_termios, which is serialised against itself.
*/
if (!old_termios || memcmp(buf, priv->line_settings, 7)) {
i = usb_control_msg(serial->dev,
usb_sndctrlpipe(serial->dev, 0),
SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
0, 0, buf, 7, 100);
dev_dbg(&port->dev, "0x21:0x20:0:0 %d\n", i);
if (i == 7)
ret = pl2303_set_line_request(port, buf);
if (!ret)
memcpy(priv->line_settings, buf, 7);
}
@ -478,10 +515,7 @@ static void pl2303_set_termios(struct tty_struct *tty,
}
memset(buf, 0, 7);
i = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
0, 0, buf, 7, 100);
dev_dbg(&port->dev, "0xa1:0x21:0:0 %d - %7ph\n", i, buf);
pl2303_get_line_request(port, buf);
if (C_CRTSCTS(tty)) {
if (spriv->type == HX)