USB: ir-usb: allow custom bulk buffer size without reallocation

Use usb_serial_driver bulk_in_size and bulk_out_size to make sure
buffers of appropriate sizes are allocated in the first place rather than
reallocating them at every open.

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

diff --git a/drivers/usb/serial/ir-usb.c b/drivers/usb/serial/ir-usb.c
index 71bdbe0..aaebb70 100644 (file)
--- a/drivers/usb/serial/ir-usb.c
+++ b/drivers/usb/serial/ir-usb.c
@@ -297,35 +297,10 @@ static int ir_startup(struct usb_serial *serial)
 
 static int ir_open(struct tty_struct *tty, struct usb_serial_port *port)
 {
-       char *buffer;
        int result = 0;
 
        dbg("%s - port %d", __func__, port->number);
 
-       if (buffer_size) {
-               /* override the default buffer sizes */
-               buffer = kmalloc(buffer_size, GFP_KERNEL);
-               if (!buffer) {
-                       dev_err(&port->dev, "%s - out of memory.\n", __func__);
-                       return -ENOMEM;
-               }
-               kfree(port->read_urb->transfer_buffer);
-               port->read_urb->transfer_buffer = buffer;
-               port->read_urb->transfer_buffer_length = buffer_size;
-               port->bulk_in_buffer = buffer;
-
-               buffer = kmalloc(buffer_size, GFP_KERNEL);
-               if (!buffer) {
-                       dev_err(&port->dev, "%s - out of memory.\n", __func__);
-                       return -ENOMEM;
-               }
-               kfree(port->write_urb->transfer_buffer);
-               port->write_urb->transfer_buffer = buffer;
-               port->write_urb->transfer_buffer_length = buffer_size;
-               port->bulk_out_buffer = buffer;
-               port->bulk_out_size = buffer_size;
-       }
-
        /* Start reading from the device */
        usb_fill_bulk_urb(
                port->read_urb,
@@ -585,6 +560,11 @@ static int __init ir_init(void)
 {
        int retval;
 
+       if (buffer_size) {
+               ir_device.bulk_in_size = buffer_size;
+               ir_device.bulk_out_size = buffer_size;
+       }
+
        retval = usb_serial_register(&ir_device);
        if (retval)
                goto failed_usb_serial_register;