USB: pl2303: add error handling to vendor read and write functions

Add error handling and clean up vendor read and write functions.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index a44154a..4058cee 100644 (file)
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -140,35 +140,46 @@ struct pl2303_private {
        u8 line_settings[7];
 };
 
-static int pl2303_vendor_read(u16 value, u16 index,
-               struct usb_serial *serial, unsigned char *buf)
+static int pl2303_vendor_read(struct usb_serial *serial, u16 value,
+                                                       unsigned char buf[1])
 {
+       struct device *dev = &serial->interface->dev;
        int res;
 
        res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
                        VENDOR_READ_REQUEST, VENDOR_READ_REQUEST_TYPE,
-                       value, index, buf, 1, 100);
+                       value, 0, buf, 1, 100);
+       if (res != 1) {
+               dev_err(dev, "%s - failed to read [%04x]: %d\n", __func__,
+                                                               value, res);
+               if (res >= 0)
+                       res = -EIO;
+
+               return res;
+       }
 
-       dev_dbg(&serial->interface->dev, "0x%x:0x%x:0x%x:0x%x  %d - %x\n",
-               VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, value, index,
-               res, buf[0]);
+       dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, buf[0]);
 
-       return res;
+       return 0;
 }
 
-static int pl2303_vendor_write(u16 value, u16 index, struct usb_serial *serial)
+static int pl2303_vendor_write(struct usb_serial *serial, u16 value, u16 index)
 {
+       struct device *dev = &serial->interface->dev;
        int res;
 
+       dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, index);
+
        res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
                        VENDOR_WRITE_REQUEST, VENDOR_WRITE_REQUEST_TYPE,
                        value, index, NULL, 0, 100);
+       if (res) {
+               dev_err(dev, "%s - failed to write [%04x]: %d\n", __func__,
+                                                               value, res);
+               return res;
+       }
 
-       dev_dbg(&serial->interface->dev, "0x%x:0x%x:0x%x:0x%x  %d\n",
-               VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, value, index,
-               res);
-
-       return res;
+       return 0;
 }
 
 static int pl2303_startup(struct usb_serial *serial)
@@ -181,7 +192,7 @@ static int pl2303_startup(struct usb_serial *serial)
        if (!spriv)
                return -ENOMEM;
 
-       buf = kmalloc(10, GFP_KERNEL);
+       buf = kmalloc(1, GFP_KERNEL);
        if (!buf) {
                kfree(spriv);
                return -ENOMEM;
@@ -200,20 +211,20 @@ static int pl2303_startup(struct usb_serial *serial)
        spriv->type = type;
        usb_set_serial_data(serial, spriv);
 
-       pl2303_vendor_read(0x8484, 0, serial, buf);
-       pl2303_vendor_write(0x0404, 0, serial);
-       pl2303_vendor_read(0x8484, 0, serial, buf);
-       pl2303_vendor_read(0x8383, 0, serial, buf);
-       pl2303_vendor_read(0x8484, 0, serial, buf);
-       pl2303_vendor_write(0x0404, 1, serial);
-       pl2303_vendor_read(0x8484, 0, serial, buf);
-       pl2303_vendor_read(0x8383, 0, serial, buf);
-       pl2303_vendor_write(0, 1, serial);
-       pl2303_vendor_write(1, 0, serial);
+       pl2303_vendor_read(serial, 0x8484, buf);
+       pl2303_vendor_write(serial, 0x0404, 0);
+       pl2303_vendor_read(serial, 0x8484, buf);
+       pl2303_vendor_read(serial, 0x8383, buf);
+       pl2303_vendor_read(serial, 0x8484, buf);
+       pl2303_vendor_write(serial, 0x0404, 1);
+       pl2303_vendor_read(serial, 0x8484, buf);
+       pl2303_vendor_read(serial, 0x8383, buf);
+       pl2303_vendor_write(serial, 0, 1);
+       pl2303_vendor_write(serial, 1, 0);
        if (type == HX)
-               pl2303_vendor_write(2, 0x44, serial);
+               pl2303_vendor_write(serial, 2, 0x44);
        else
-               pl2303_vendor_write(2, 0x24, serial);
+               pl2303_vendor_write(serial, 2, 0x24);
 
        kfree(buf);
 
@@ -473,11 +484,11 @@ static void pl2303_set_termios(struct tty_struct *tty,
 
        if (C_CRTSCTS(tty)) {
                if (spriv->type == HX)
-                       pl2303_vendor_write(0x0, 0x61, serial);
+                       pl2303_vendor_write(serial, 0x0, 0x61);
                else
-                       pl2303_vendor_write(0x0, 0x41, serial);
+                       pl2303_vendor_write(serial, 0x0, 0x41);
        } else {
-               pl2303_vendor_write(0x0, 0x0, serial);
+               pl2303_vendor_write(serial, 0x0, 0x0);
        }
 
        kfree(buf);
@@ -517,8 +528,8 @@ static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port)
                usb_clear_halt(serial->dev, port->read_urb->pipe);
        } else {
                /* reset upstream data pipes */
-               pl2303_vendor_write(8, 0, serial);
-               pl2303_vendor_write(9, 0, serial);
+               pl2303_vendor_write(serial, 8, 0);
+               pl2303_vendor_write(serial, 9, 0);
        }
 
        /* Setup termios */