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Commit ae64387a authored by Alan Cox's avatar Alan Cox Committed by Linus Torvalds
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tty-usb-generic: Code cleanup 



Signed-off-by: default avatarAlan Cox <alan@redhat.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent af6d780b

drivers/usb/serial/generic.c

+49 −38
Original line number Diff line number Diff line
@@ -18,7 +18,7 @@ 
#include <linux/moduleparam.h>

#include <linux/usb.h>

#include <linux/usb/serial.h>

#include <asm/uaccess.h>

#include <linux/uaccess.h>





static int debug;
@@ -89,7 +89,8 @@ int usb_serial_generic_register (int _debug) 
#ifdef CONFIG_USB_SERIAL_GENERIC

	generic_device_ids[0].idVendor = vendor;

	generic_device_ids[0].idProduct = product;

	generic_device_ids[0].match_flags = USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_PRODUCT;

	generic_device_ids[0].match_flags =

		USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_PRODUCT;



	/* register our generic driver with ourselves */

	retval = usb_serial_register(&usb_serial_generic_device);
@@ -121,9 +122,9 @@ int usb_serial_generic_open(struct tty_struct *tty, 


	dbg("%s - port %d", __func__, port->number);



	/* force low_latency on so that our tty_push actually forces the data through, 

	   otherwise it is scheduled, and with high data rates (like with OHCI) data

	   can get lost. */

	/* force low_latency on so that our tty_push actually forces the data

	   through, otherwise it is scheduled, and with high data rates (like

	   with OHCI) data can get lost. */

	if (tty)

		tty->low_latency = 1;
@@ -137,7 +138,8 @@ int usb_serial_generic_open(struct tty_struct *tty, 
	if (serial->num_bulk_in) {

		/* Start reading from the device */

		usb_fill_bulk_urb(port->read_urb, serial->dev,

				   usb_rcvbulkpipe(serial->dev, port->bulk_in_endpointAddress),

				   usb_rcvbulkpipe(serial->dev,

						port->bulk_in_endpointAddress),

				   port->read_urb->transfer_buffer,

				   port->read_urb->transfer_buffer_length,

				   ((serial->type->read_bulk_callback) ?
@@ -146,7 +148,9 @@ int usb_serial_generic_open(struct tty_struct *tty, 
				   port);

		result = usb_submit_urb(port->read_urb, GFP_KERNEL);

		if (result)

			dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n", __func__, result);

			dev_err(&port->dev,

			    "%s - failed resubmitting read urb, error %d\n",

							__func__, result);

	}



	return result;
@@ -211,7 +215,7 @@ int usb_serial_generic_write(struct tty_struct *tty, 


	if (count == 0) {

		dbg("%s - write request of 0 bytes", __func__);

		return (0);

		return 0;

	}



	/* only do something if we have a bulk out endpoint */
@@ -226,7 +230,8 @@ int usb_serial_generic_write(struct tty_struct *tty, 
		port->write_urb_busy = 1;

		spin_unlock_irqrestore(&port->lock, flags);



		count = (count > port->bulk_out_size) ? port->bulk_out_size : count;

		count = (count > port->bulk_out_size) ?

					port->bulk_out_size : count;



		memcpy(port->write_urb->transfer_buffer, buf, count);

		data = port->write_urb->transfer_buffer;
@@ -239,14 +244,18 @@ int usb_serial_generic_write(struct tty_struct *tty, 
				   port->write_urb->transfer_buffer, count,

				   ((serial->type->write_bulk_callback) ?

				     serial->type->write_bulk_callback :

				     usb_serial_generic_write_bulk_callback), port);

				     usb_serial_generic_write_bulk_callback),

				   port);



		/* send the data out the bulk port */

		port->write_urb_busy = 1;

		result = usb_submit_urb(port->write_urb, GFP_ATOMIC);

		if (result) {

			dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __func__, result);

			/* don't have to grab the lock here, as we will retry if != 0 */

			dev_err(&port->dev,

				"%s - failed submitting write urb, error %d\n",

							__func__, result);

			/* don't have to grab the lock here, as we will

			   retry if != 0 */

			port->write_urb_busy = 0;

		} else

			result = count;
@@ -312,7 +321,9 @@ static void resubmit_read_urb(struct usb_serial_port *port, gfp_t mem_flags) 
			     usb_serial_generic_read_bulk_callback), port);

	result = usb_submit_urb(urb, mem_flags);

	if (result)

		dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n", __func__, result);

		dev_err(&port->dev,

			"%s - failed resubmitting read urb, error %d\n",

							__func__, result);

}



/* Push data to tty layer and resubmit the bulk read URB */
@@ -349,17 +360,18 @@ void usb_serial_generic_read_bulk_callback(struct urb *urb) 
		return;

	}



	usb_serial_debug_data(debug, &port->dev, __func__, urb->actual_length, data);

	usb_serial_debug_data(debug, &port->dev, __func__,

						urb->actual_length, data);



	/* Throttle the device if requested by tty */

	spin_lock_irqsave(&port->lock, flags);

	if (!(port->throttled = port->throttle_req)) {

	port->throttled = port->throttle_req;

	if (!port->throttled) {

		spin_unlock_irqrestore(&port->lock, flags);

		flush_and_resubmit_read_urb(port);

	} else {

	} else

		spin_unlock_irqrestore(&port->lock, flags);

}

}

EXPORT_SYMBOL_GPL(usb_serial_generic_read_bulk_callback);



void usb_serial_generic_write_bulk_callback(struct urb *urb)
@@ -420,8 +432,7 @@ void usb_serial_generic_shutdown (struct usb_serial *serial) 
	dbg("%s", __func__);



	/* stop reads and writes on all ports */

	for (i=0; i < serial->num_ports; ++i) {

	for (i = 0; i < serial->num_ports; ++i)

		generic_cleanup(serial->port[i]);

}

}