/*
* KLSI KL5KUSB105 chip RS232 converter driver
*
+ * Copyright (C) 2010 Johan Hovold <jhovold@gmail.com>
* Copyright (C) 2001 Utz-Uwe Haus <haus@uuhaus.de>
*
* This program is free software; you can redistribute it and/or modify
* implement handshaking or decide that we do not support it
*/
-/* History:
- * 0.3a - implemented pools of write URBs
- * 0.3 - alpha version for public testing
- * 0.2 - TIOCMGET works, so autopilot(1) can be used!
- * 0.1 - can be used to to pilot-xfer -p /dev/ttyUSB0 -l
- *
- * The driver skeleton is mainly based on mct_u232.c and various other
- * pieces of code shamelessly copied from the drivers/usb/serial/ directory.
- */
-
-
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
/*
* Version Information
*/
-#define DRIVER_VERSION "v0.3a"
-#define DRIVER_AUTHOR "Utz-Uwe Haus <haus@uuhaus.de>"
+#define DRIVER_VERSION "v0.4"
+#define DRIVER_AUTHOR "Utz-Uwe Haus <haus@uuhaus.de>, Johan Hovold <jhovold@gmail.com>"
#define DRIVER_DESC "KLSI KL5KUSB105 chipset USB->Serial Converter driver"
* Function prototypes
*/
static int klsi_105_startup(struct usb_serial *serial);
-static void klsi_105_disconnect(struct usb_serial *serial);
static void klsi_105_release(struct usb_serial *serial);
static int klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port);
static void klsi_105_close(struct usb_serial_port *port);
-static int klsi_105_write(struct tty_struct *tty,
- struct usb_serial_port *port, const unsigned char *buf, int count);
-static void klsi_105_write_bulk_callback(struct urb *urb);
-static int klsi_105_chars_in_buffer(struct tty_struct *tty);
-static int klsi_105_write_room(struct tty_struct *tty);
-static void klsi_105_read_bulk_callback(struct urb *urb);
static void klsi_105_set_termios(struct tty_struct *tty,
struct usb_serial_port *port, struct ktermios *old);
-static void klsi_105_throttle(struct tty_struct *tty);
-static void klsi_105_unthrottle(struct tty_struct *tty);
static int klsi_105_tiocmget(struct tty_struct *tty, struct file *file);
static int klsi_105_tiocmset(struct tty_struct *tty, struct file *file,
unsigned int set, unsigned int clear);
+static void klsi_105_process_read_urb(struct urb *urb);
+static int klsi_105_prepare_write_buffer(struct usb_serial_port *port,
+ void *dest, size_t size);
/*
* All of the device info needed for the KLSI converters.
*/
-static struct usb_device_id id_table [] = {
+static const struct usb_device_id id_table[] = {
{ USB_DEVICE(PALMCONNECT_VID, PALMCONNECT_PID) },
{ USB_DEVICE(KLSI_VID, KLSI_KL5KUSB105D_PID) },
{ } /* Terminating entry */
.probe = usb_serial_probe,
.disconnect = usb_serial_disconnect,
.id_table = id_table,
- .no_dynamic_id = 1,
+ .no_dynamic_id = 1,
};
static struct usb_serial_driver kl5kusb105d_device = {
.owner = THIS_MODULE,
.name = "kl5kusb105d",
},
- .description = "KL5KUSB105D / PalmConnect",
- .usb_driver = &kl5kusb105d_driver,
- .id_table = id_table,
- .num_ports = 1,
- .open = klsi_105_open,
- .close = klsi_105_close,
- .write = klsi_105_write,
- .write_bulk_callback = klsi_105_write_bulk_callback,
- .chars_in_buffer = klsi_105_chars_in_buffer,
- .write_room = klsi_105_write_room,
- .read_bulk_callback = klsi_105_read_bulk_callback,
- .set_termios = klsi_105_set_termios,
- /*.break_ctl = klsi_105_break_ctl,*/
- .tiocmget = klsi_105_tiocmget,
- .tiocmset = klsi_105_tiocmset,
- .attach = klsi_105_startup,
- .disconnect = klsi_105_disconnect,
- .release = klsi_105_release,
- .throttle = klsi_105_throttle,
- .unthrottle = klsi_105_unthrottle,
+ .description = "KL5KUSB105D / PalmConnect",
+ .usb_driver = &kl5kusb105d_driver,
+ .id_table = id_table,
+ .num_ports = 1,
+ .bulk_out_size = 64,
+ .open = klsi_105_open,
+ .close = klsi_105_close,
+ .set_termios = klsi_105_set_termios,
+ /*.break_ctl = klsi_105_break_ctl,*/
+ .tiocmget = klsi_105_tiocmget,
+ .tiocmset = klsi_105_tiocmset,
+ .attach = klsi_105_startup,
+ .release = klsi_105_release,
+ .throttle = usb_serial_generic_throttle,
+ .unthrottle = usb_serial_generic_unthrottle,
+ .process_read_urb = klsi_105_process_read_urb,
+ .prepare_write_buffer = klsi_105_prepare_write_buffer,
};
struct klsi_105_port_settings {
__u8 unknown2;
} __attribute__ ((packed));
-/* we implement a pool of NUM_URBS urbs per usb_serial */
-#define NUM_URBS 1
-#define URB_TRANSFER_BUFFER_SIZE 64
struct klsi_105_private {
struct klsi_105_port_settings cfg;
struct ktermios termios;
unsigned long line_state; /* modem line settings */
- /* write pool */
- struct urb *write_urb_pool[NUM_URBS];
spinlock_t lock;
- unsigned long bytes_in;
- unsigned long bytes_out;
};
settings->pktlen, settings->baudrate, settings->databits,
settings->unknown1, settings->unknown2);
return rc;
-} /* klsi_105_chg_port_settings */
+}
/* translate a 16-bit status value from the device to linux's TIO bits */
static unsigned long klsi_105_status2linestate(const __u16 status)
return res;
}
+
/*
* Read line control via vendor command and return result through
* *line_state_p
unsigned long *line_state_p)
{
int rc;
- __u8 status_buf[KLSI_STATUSBUF_LEN] = { -1, -1};
+ u8 *status_buf;
__u16 status;
dev_info(&port->serial->dev->dev, "sending SIO Poll request\n");
+
+ status_buf = kmalloc(KLSI_STATUSBUF_LEN, GFP_KERNEL);
+ if (!status_buf) {
+ dev_err(&port->dev, "%s - out of memory for status buffer.\n",
+ __func__);
+ return -ENOMEM;
+ }
+ status_buf[0] = 0xff;
+ status_buf[1] = 0xff;
rc = usb_control_msg(port->serial->dev,
usb_rcvctrlpipe(port->serial->dev, 0),
KL5KUSB105A_SIO_POLL,
*line_state_p = klsi_105_status2linestate(status);
}
+
+ kfree(status_buf);
return rc;
}
static int klsi_105_startup(struct usb_serial *serial)
{
struct klsi_105_private *priv;
- int i, j;
+ int i;
/* check if we support the product id (see keyspan.c)
* FIXME
priv->line_state = 0;
- priv->bytes_in = 0;
- priv->bytes_out = 0;
usb_set_serial_port_data(serial->port[i], priv);
spin_lock_init(&priv->lock);
- for (j = 0; j < NUM_URBS; j++) {
- struct urb *urb = usb_alloc_urb(0, GFP_KERNEL);
-
- priv->write_urb_pool[j] = urb;
- if (urb == NULL) {
- dev_err(&serial->dev->dev, "No more urbs???\n");
- goto err_cleanup;
- }
-
- urb->transfer_buffer =
- kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
- if (!urb->transfer_buffer) {
- dev_err(&serial->dev->dev,
- "%s - out of memory for urb buffers.\n",
- __func__);
- goto err_cleanup;
- }
- }
/* priv->termios is left uninitalized until port opening */
init_waitqueue_head(&serial->port[i]->write_wait);
err_cleanup:
for (; i >= 0; i--) {
priv = usb_get_serial_port_data(serial->port[i]);
- for (j = 0; j < NUM_URBS; j++) {
- if (priv->write_urb_pool[j]) {
- kfree(priv->write_urb_pool[j]->transfer_buffer);
- usb_free_urb(priv->write_urb_pool[j]);
- }
- }
+ kfree(priv);
usb_set_serial_port_data(serial->port[i], NULL);
}
return -ENOMEM;
-} /* klsi_105_startup */
-
-
-static void klsi_105_disconnect(struct usb_serial *serial)
-{
- int i;
-
- dbg("%s", __func__);
-
- /* stop reads and writes on all ports */
- for (i = 0; i < serial->num_ports; ++i) {
- struct klsi_105_private *priv =
- usb_get_serial_port_data(serial->port[i]);
-
- if (priv) {
- /* kill our write urb pool */
- int j;
- struct urb **write_urbs = priv->write_urb_pool;
-
- for (j = 0; j < NUM_URBS; j++) {
- if (write_urbs[j]) {
- usb_kill_urb(write_urbs[j]);
- usb_free_urb(write_urbs[j]);
- }
- }
- }
- }
-} /* klsi_105_disconnect */
-
+}
static void klsi_105_release(struct usb_serial *serial)
{
dbg("%s", __func__);
- for (i = 0; i < serial->num_ports; ++i) {
- struct klsi_105_private *priv =
- usb_get_serial_port_data(serial->port[i]);
-
- kfree(priv);
- }
-} /* klsi_105_release */
+ for (i = 0; i < serial->num_ports; ++i)
+ kfree(usb_get_serial_port_data(serial->port[i]));
+}
static int klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port)
{
int rc;
int i;
unsigned long line_state;
- struct klsi_105_port_settings cfg;
+ struct klsi_105_port_settings *cfg;
unsigned long flags;
dbg("%s port %d", __func__, port->number);
* Then read the modem line control and store values in
* priv->line_state.
*/
- cfg.pktlen = 5;
- cfg.baudrate = kl5kusb105a_sio_b9600;
- cfg.databits = kl5kusb105a_dtb_8;
- cfg.unknown1 = 0;
- cfg.unknown2 = 1;
- klsi_105_chg_port_settings(port, &cfg);
+ cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
+ if (!cfg) {
+ dev_err(&port->dev, "%s - out of memory for config buffer.\n",
+ __func__);
+ return -ENOMEM;
+ }
+ cfg->pktlen = 5;
+ cfg->baudrate = kl5kusb105a_sio_b9600;
+ cfg->databits = kl5kusb105a_dtb_8;
+ cfg->unknown1 = 0;
+ cfg->unknown2 = 1;
+ klsi_105_chg_port_settings(port, cfg);
/* set up termios structure */
spin_lock_irqsave(&priv->lock, flags);
priv->termios.c_lflag = tty->termios->c_lflag;
for (i = 0; i < NCCS; i++)
priv->termios.c_cc[i] = tty->termios->c_cc[i];
- priv->cfg.pktlen = cfg.pktlen;
- priv->cfg.baudrate = cfg.baudrate;
- priv->cfg.databits = cfg.databits;
- priv->cfg.unknown1 = cfg.unknown1;
- priv->cfg.unknown2 = cfg.unknown2;
+ priv->cfg.pktlen = cfg->pktlen;
+ priv->cfg.baudrate = cfg->baudrate;
+ priv->cfg.databits = cfg->databits;
+ priv->cfg.unknown1 = cfg->unknown1;
+ priv->cfg.unknown2 = cfg->unknown2;
spin_unlock_irqrestore(&priv->lock, flags);
/* READ_ON and urb submission */
- usb_fill_bulk_urb(port->read_urb, port->serial->dev,
- usb_rcvbulkpipe(port->serial->dev,
- port->bulk_in_endpointAddress),
- port->read_urb->transfer_buffer,
- port->read_urb->transfer_buffer_length,
- klsi_105_read_bulk_callback,
- port);
-
- rc = usb_submit_urb(port->read_urb, GFP_KERNEL);
+ rc = usb_serial_generic_open(tty, port);
if (rc) {
- dev_err(&port->dev, "%s - failed submitting read urb, "
- "error %d\n", __func__, rc);
retval = rc;
goto exit;
}
retval = rc;
exit:
+ kfree(cfg);
return retval;
-} /* klsi_105_open */
-
+}
static void klsi_105_close(struct usb_serial_port *port)
{
- struct klsi_105_private *priv = usb_get_serial_port_data(port);
int rc;
dbg("%s port %d", __func__, port->number);
mutex_unlock(&port->serial->disc_mutex);
/* shutdown our bulk reads and writes */
- usb_kill_urb(port->write_urb);
- usb_kill_urb(port->read_urb);
- /* unlink our write pool */
- /* FIXME */
+ usb_serial_generic_close(port);
+
/* wgg - do I need this? I think so. */
usb_kill_urb(port->interrupt_in_urb);
- dev_info(&port->serial->dev->dev,
- "port stats: %ld bytes in, %ld bytes out\n",
- priv->bytes_in, priv->bytes_out);
-} /* klsi_105_close */
-
+}
/* We need to write a complete 64-byte data block and encode the
* number actually sent in the first double-byte, LSB-order. That
* leaves at most 62 bytes of payload.
*/
-#define KLSI_105_DATA_OFFSET 2 /* in the bulk urb data block */
-
-
-static int klsi_105_write(struct tty_struct *tty,
- struct usb_serial_port *port, const unsigned char *buf, int count)
-{
- struct klsi_105_private *priv = usb_get_serial_port_data(port);
- int result, size;
- int bytes_sent = 0;
-
- dbg("%s - port %d", __func__, port->number);
-
- while (count > 0) {
- /* try to find a free urb (write 0 bytes if none) */
- struct urb *urb = NULL;
- unsigned long flags;
- int i;
- /* since the pool is per-port we might not need
- the spin lock !? */
- spin_lock_irqsave(&priv->lock, flags);
- for (i = 0; i < NUM_URBS; i++) {
- if (priv->write_urb_pool[i]->status != -EINPROGRESS) {
- urb = priv->write_urb_pool[i];
- dbg("%s - using pool URB %d", __func__, i);
- break;
- }
- }
- spin_unlock_irqrestore(&priv->lock, flags);
-
- if (urb == NULL) {
- dbg("%s - no more free urbs", __func__);
- goto exit;
- }
-
- if (urb->transfer_buffer == NULL) {
- urb->transfer_buffer =
- kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_ATOMIC);
- if (urb->transfer_buffer == NULL) {
- dev_err(&port->dev,
- "%s - no more kernel memory...\n",
- __func__);
- goto exit;
- }
- }
-
- size = min(count, port->bulk_out_size - KLSI_105_DATA_OFFSET);
- size = min(size, URB_TRANSFER_BUFFER_SIZE -
- KLSI_105_DATA_OFFSET);
-
- memcpy(urb->transfer_buffer + KLSI_105_DATA_OFFSET, buf, size);
-
- /* write payload size into transfer buffer */
- ((__u8 *)urb->transfer_buffer)[0] = (__u8) (size & 0xFF);
- ((__u8 *)urb->transfer_buffer)[1] = (__u8) ((size & 0xFF00)>>8);
-
- /* set up our urb */
- usb_fill_bulk_urb(urb, port->serial->dev,
- usb_sndbulkpipe(port->serial->dev,
- port->bulk_out_endpointAddress),
- urb->transfer_buffer,
- URB_TRANSFER_BUFFER_SIZE,
- klsi_105_write_bulk_callback,
- port);
-
- /* send the data out the bulk port */
- result = usb_submit_urb(urb, GFP_ATOMIC);
- if (result) {
- dev_err(&port->dev,
- "%s - failed submitting write urb, error %d\n",
- __func__, result);
- goto exit;
- }
- buf += size;
- bytes_sent += size;
- count -= size;
- }
-exit:
- /* lockless, but it's for debug info only... */
- priv->bytes_out += bytes_sent;
-
- return bytes_sent; /* that's how much we wrote */
-} /* klsi_105_write */
-
-static void klsi_105_write_bulk_callback(struct urb *urb)
-{
- struct usb_serial_port *port = urb->context;
- int status = urb->status;
-
- dbg("%s - port %d", __func__, port->number);
-
- if (status) {
- dbg("%s - nonzero write bulk status received: %d", __func__,
- status);
- return;
- }
-
- usb_serial_port_softint(port);
-} /* klsi_105_write_bulk_completion_callback */
-
-
-/* return number of characters currently in the writing process */
-static int klsi_105_chars_in_buffer(struct tty_struct *tty)
+#define KLSI_HDR_LEN 2
+static int klsi_105_prepare_write_buffer(struct usb_serial_port *port,
+ void *dest, size_t size)
{
- struct usb_serial_port *port = tty->driver_data;
- int chars = 0;
- int i;
- unsigned long flags;
- struct klsi_105_private *priv = usb_get_serial_port_data(port);
-
- spin_lock_irqsave(&priv->lock, flags);
-
- for (i = 0; i < NUM_URBS; ++i) {
- if (priv->write_urb_pool[i]->status == -EINPROGRESS)
- chars += URB_TRANSFER_BUFFER_SIZE;
- }
+ unsigned char *buf = dest;
+ int count;
- spin_unlock_irqrestore(&priv->lock, flags);
+ count = kfifo_out_locked(&port->write_fifo, buf + KLSI_HDR_LEN, size,
+ &port->lock);
+ put_unaligned_le16(count, buf);
- dbg("%s - returns %d", __func__, chars);
- return chars;
+ return count + KLSI_HDR_LEN;
}
-static int klsi_105_write_room(struct tty_struct *tty)
-{
- struct usb_serial_port *port = tty->driver_data;
- unsigned long flags;
- int i;
- int room = 0;
- struct klsi_105_private *priv = usb_get_serial_port_data(port);
-
- spin_lock_irqsave(&priv->lock, flags);
- for (i = 0; i < NUM_URBS; ++i) {
- if (priv->write_urb_pool[i]->status != -EINPROGRESS)
- room += URB_TRANSFER_BUFFER_SIZE;
- }
-
- spin_unlock_irqrestore(&priv->lock, flags);
-
- dbg("%s - returns %d", __func__, room);
- return room;
-}
-
-
-
-static void klsi_105_read_bulk_callback(struct urb *urb)
+/* The data received is preceded by a length double-byte in LSB-first order.
+ */
+static void klsi_105_process_read_urb(struct urb *urb)
{
struct usb_serial_port *port = urb->context;
- struct klsi_105_private *priv = usb_get_serial_port_data(port);
- struct tty_struct *tty;
unsigned char *data = urb->transfer_buffer;
- int rc;
- int status = urb->status;
+ struct tty_struct *tty;
+ unsigned len;
- dbg("%s - port %d", __func__, port->number);
+ /* empty urbs seem to happen, we ignore them */
+ if (!urb->actual_length)
+ return;
- /* The urb might have been killed. */
- if (status) {
- dbg("%s - nonzero read bulk status received: %d", __func__,
- status);
+ if (urb->actual_length <= KLSI_HDR_LEN) {
+ dbg("%s - malformed packet", __func__);
return;
}
- /* The data received is again preceded by a length double-byte in LSB-
- * first order (see klsi_105_write() )
- */
- if (urb->actual_length == 0) {
- /* empty urbs seem to happen, we ignore them */
- /* dbg("%s - emtpy URB", __func__); */
- ;
- } else if (urb->actual_length <= 2) {
- dbg("%s - size %d URB not understood", __func__,
- urb->actual_length);
- usb_serial_debug_data(debug, &port->dev, __func__,
- urb->actual_length, data);
- } else {
- int bytes_sent = ((__u8 *) data)[0] +
- ((unsigned int) ((__u8 *) data)[1] << 8);
- tty = tty_port_tty_get(&port->port);
- /* we should immediately resubmit the URB, before attempting
- * to pass the data on to the tty layer. But that needs locking
- * against re-entry an then mixed-up data because of
- * intermixed tty_flip_buffer_push()s
- * FIXME
- */
- usb_serial_debug_data(debug, &port->dev, __func__,
- urb->actual_length, data);
-
- if (bytes_sent + 2 > urb->actual_length) {
- dbg("%s - trying to read more data than available"
- " (%d vs. %d)", __func__,
- bytes_sent+2, urb->actual_length);
- /* cap at implied limit */
- bytes_sent = urb->actual_length - 2;
- }
-
- tty_buffer_request_room(tty, bytes_sent);
- tty_insert_flip_string(tty, data + 2, bytes_sent);
- tty_flip_buffer_push(tty);
- tty_kref_put(tty);
+ tty = tty_port_tty_get(&port->port);
+ if (!tty)
+ return;
- /* again lockless, but debug info only */
- priv->bytes_in += bytes_sent;
+ len = get_unaligned_le16(data);
+ if (len > urb->actual_length - KLSI_HDR_LEN) {
+ dbg("%s - packet length mismatch", __func__);
+ len = urb->actual_length - KLSI_HDR_LEN;
}
- /* Continue trying to always read */
- usb_fill_bulk_urb(port->read_urb, port->serial->dev,
- usb_rcvbulkpipe(port->serial->dev,
- port->bulk_in_endpointAddress),
- port->read_urb->transfer_buffer,
- port->read_urb->transfer_buffer_length,
- klsi_105_read_bulk_callback,
- port);
- rc = usb_submit_urb(port->read_urb, GFP_ATOMIC);
- if (rc)
- dev_err(&port->dev,
- "%s - failed resubmitting read urb, error %d\n",
- __func__, rc);
-} /* klsi_105_read_bulk_callback */
+ tty_insert_flip_string(tty, data + KLSI_HDR_LEN, len);
+ tty_flip_buffer_push(tty);
+ tty_kref_put(tty);
+}
static void klsi_105_set_termios(struct tty_struct *tty,
struct usb_serial_port *port,
unsigned int old_iflag = old_termios->c_iflag;
unsigned int cflag = tty->termios->c_cflag;
unsigned int old_cflag = old_termios->c_cflag;
- struct klsi_105_port_settings cfg;
+ struct klsi_105_port_settings *cfg;
unsigned long flags;
speed_t baud;
+ cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
+ if (!cfg) {
+ dev_err(&port->dev, "%s - out of memory for config buffer.\n",
+ __func__);
+ return;
+ }
+
/* lock while we are modifying the settings */
spin_lock_irqsave(&priv->lock, flags);
case CS5:
dbg("%s - 5 bits/byte not supported", __func__);
spin_unlock_irqrestore(&priv->lock, flags);
- return ;
+ goto err;
case CS6:
dbg("%s - 6 bits/byte not supported", __func__);
spin_unlock_irqrestore(&priv->lock, flags);
- return ;
+ goto err;
case CS7:
priv->cfg.databits = kl5kusb105a_dtb_7;
break;
#endif
;
}
- memcpy(&cfg, &priv->cfg, sizeof(cfg));
+ memcpy(cfg, &priv->cfg, sizeof(*cfg));
spin_unlock_irqrestore(&priv->lock, flags);
/* now commit changes to device */
- klsi_105_chg_port_settings(port, &cfg);
-} /* klsi_105_set_termios */
-
+ klsi_105_chg_port_settings(port, cfg);
+err:
+ kfree(cfg);
+}
#if 0
static void mct_u232_break_ctl(struct tty_struct *tty, int break_state)
lcr |= MCT_U232_SET_BREAK;
mct_u232_set_line_ctrl(serial, lcr);
-} /* mct_u232_break_ctl */
+}
#endif
static int klsi_105_tiocmget(struct tty_struct *tty, struct file *file)
return retval;
}
-static void klsi_105_throttle(struct tty_struct *tty)
-{
- struct usb_serial_port *port = tty->driver_data;
- dbg("%s - port %d", __func__, port->number);
- usb_kill_urb(port->read_urb);
-}
-
-static void klsi_105_unthrottle(struct tty_struct *tty)
-{
- struct usb_serial_port *port = tty->driver_data;
- int result;
-
- dbg("%s - port %d", __func__, port->number);
-
- port->read_urb->dev = port->serial->dev;
- result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
- if (result)
- dev_err(&port->dev,
- "%s - failed submitting read urb, error %d\n",
- __func__, result);
-}
-
-
static int __init klsi_105_init(void)
{
return retval;
}
-
static void __exit klsi_105_exit(void)
{
usb_deregister(&kl5kusb105d_driver);
module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "enable extensive debugging messages");
-
-/* vim: set sts=8 ts=8 sw=8: */
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff