USB: serial: ir_usb: Clean up the worst of it, remove exciting 'crash on open' feature
- Drivers don't call ldisc termios methods. They certainly don't call
them the way this one does - remove wrong call
- The tty buffer code isn't designed to be abused from IRQ handlers and
the new buffering removes the need for the uglies involved - fix them
- Style
- Remove incorrect baud and change handling for termios changes
The driver now has some style, but not a lot - it goes insane if you have
two dongles for example as it continues to use global variables for per
dongle state. That bit isn't my problem.
Signed-off-by: Alan Cox <alan@redhat.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 8cec5e5..5ab6a0c 100644
--- a/drivers/usb/serial/ir-usb.c
+++ b/drivers/usb/serial/ir-usb.c
@@ -21,6 +21,10 @@
*
* See Documentation/usb/usb-serial.txt for more information on using this driver
*
+ * 2007_Jun_21 Alan Cox <alan@redhat.com>
+ * Minimal cleanups for some of the driver problens and tty layer abuse.
+ * Still needs fixing to allow multiple dongles.
+ *
* 2002_Mar_07 greg kh
* moved some needed structures and #define values from the
* net/irda/irda-usb.h file into our file, as we don't want to depend on
@@ -109,6 +113,7 @@
static void ir_read_bulk_callback (struct urb *urb);
static void ir_set_termios (struct usb_serial_port *port, struct ktermios *old_termios);
+/* Not that this lot means you can only have one per system */
static u8 ir_baud = 0;
static u8 ir_xbof = 0;
static u8 ir_add_bof = 0;
@@ -446,22 +451,12 @@
urb->actual_length,
data);
- /*
- * Bypass flip-buffers, and feed the ldisc directly
- * due to our potentially large buffer size. Since we
- * used to set low_latency, this is exactly what the
- * tty layer did anyway :)
- */
tty = port->tty;
- /*
- * FIXME: must not do this in IRQ context
- */
- tty->ldisc.receive_buf(
- tty,
- data+1,
- NULL,
- urb->actual_length-1);
+ if (tty_buffer_request_room(tty, urb->actual_length - 1)) {
+ tty_insert_flip_string(tty, data+1, urb->actual_length - 1);
+ tty_flip_buffer_push(tty);
+ }
/*
* No break here.
@@ -503,8 +498,9 @@
static void ir_set_termios (struct usb_serial_port *port, struct ktermios *old_termios)
{
unsigned char *transfer_buffer;
- unsigned int cflag;
int result;
+ speed_t baud;
+ int ir_baud;
dbg("%s - port %d", __FUNCTION__, port->number);
@@ -513,77 +509,59 @@
return;
}
- cflag = port->tty->termios->c_cflag;
- /* check that they really want us to change something */
- if (old_termios) {
- if ((cflag == old_termios->c_cflag) &&
- (RELEVANT_IFLAG(port->tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) {
- dbg("%s - nothing to change...", __FUNCTION__);
- return;
- }
+ baud = tty_get_baud_rate(port->tty);
+
+ /*
+ * FIXME, we should compare the baud request against the
+ * capability stated in the IR header that we got in the
+ * startup function.
+ */
+
+ switch (baud) {
+ case 2400: ir_baud = SPEED_2400; break;
+ case 9600: ir_baud = SPEED_9600; break;
+ case 19200: ir_baud = SPEED_19200; break;
+ case 38400: ir_baud = SPEED_38400; break;
+ case 57600: ir_baud = SPEED_57600; break;
+ case 115200: ir_baud = SPEED_115200; break;
+ case 576000: ir_baud = SPEED_576000; break;
+ case 1152000: ir_baud = SPEED_1152000; break;
+ case 4000000: ir_baud = SPEED_4000000; break;
+ break;
+ default:
+ ir_baud = SPEED_9600;
+ baud = 9600;
+ /* And once the new tty stuff is all done we need to
+ call back to correct the baud bits */
}
- /* All we can change is the baud rate */
- if (cflag & CBAUD) {
+ if (xbof == -1)
+ ir_xbof = ir_xbof_change(ir_add_bof);
+ else
+ ir_xbof = ir_xbof_change(xbof) ;
- dbg ("%s - asking for baud %d",
- __FUNCTION__,
- tty_get_baud_rate(port->tty));
+ /* FIXME need to check to see if our write urb is busy right
+ * now, or use a urb pool.
+ *
+ * send the baud change out on an "empty" data packet
+ */
+ transfer_buffer = port->write_urb->transfer_buffer;
+ *transfer_buffer = ir_xbof | ir_baud;
- /*
- * FIXME, we should compare the baud request against the
- * capability stated in the IR header that we got in the
- * startup function.
- */
- switch (cflag & CBAUD) {
- case B2400: ir_baud = SPEED_2400; break;
- default:
- case B9600: ir_baud = SPEED_9600; break;
- case B19200: ir_baud = SPEED_19200; break;
- case B38400: ir_baud = SPEED_38400; break;
- case B57600: ir_baud = SPEED_57600; break;
- case B115200: ir_baud = SPEED_115200; break;
- case B576000: ir_baud = SPEED_576000; break;
- case B1152000: ir_baud = SPEED_1152000; break;
-#ifdef B4000000
- case B4000000: ir_baud = SPEED_4000000; break;
-#endif
- }
+ usb_fill_bulk_urb (
+ port->write_urb,
+ port->serial->dev,
+ usb_sndbulkpipe(port->serial->dev, port->bulk_out_endpointAddress),
+ port->write_urb->transfer_buffer,
+ 1,
+ ir_write_bulk_callback,
+ port);
- if (xbof == -1) {
- ir_xbof = ir_xbof_change(ir_add_bof);
- } else {
- ir_xbof = ir_xbof_change(xbof) ;
- }
+ port->write_urb->transfer_flags = URB_ZERO_PACKET;
- /* Notify the tty driver that the termios have changed. */
- port->tty->ldisc.set_termios(port->tty, NULL);
-
- /* FIXME need to check to see if our write urb is busy right
- * now, or use a urb pool.
- *
- * send the baud change out on an "empty" data packet
- */
- transfer_buffer = port->write_urb->transfer_buffer;
- *transfer_buffer = ir_xbof | ir_baud;
-
- usb_fill_bulk_urb (
- port->write_urb,
- port->serial->dev,
- usb_sndbulkpipe(port->serial->dev,
- port->bulk_out_endpointAddress),
- port->write_urb->transfer_buffer,
- 1,
- ir_write_bulk_callback,
- port);
-
- port->write_urb->transfer_flags = URB_ZERO_PACKET;
-
- result = usb_submit_urb (port->write_urb, GFP_KERNEL);
- if (result)
- dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result);
- }
- return;
+ result = usb_submit_urb (port->write_urb, GFP_KERNEL);
+ if (result)
+ dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result);
}