From: Jim Radford Date: Wed, 28 Feb 2007 18:10:50 +0000 (-0800) Subject: USB: ftdi_sio: use port_probe / port_remove thereby fixing access to the latency_timer X-Git-Tag: v2.6.21-rc4~54^2~9 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=12bdbe03c8db7139de1de5c622cb0609d259cece;p=linux-2.6 USB: ftdi_sio: use port_probe / port_remove thereby fixing access to the latency_timer Convert all the port specific code in attach / shutdown to use the new port_probe / port_register callbacks from device_register / device_unregister allowing adding the sysfs attributes to be added at the correct time and to the serial port device itself, instead of to the unadorned usb device, avoiding a NULL dereference. Signed-off-by: Jim Radford Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c index 07884e0803..ada4e6c6f9 100644 --- a/drivers/usb/serial/ftdi_sio.c +++ b/drivers/usb/serial/ftdi_sio.c @@ -597,6 +597,8 @@ struct ftdi_private { static int ftdi_sio_probe (struct usb_serial *serial, const struct usb_device_id *id); static int ftdi_sio_attach (struct usb_serial *serial); static void ftdi_shutdown (struct usb_serial *serial); +static int ftdi_sio_port_probe (struct usb_serial_port *port); +static int ftdi_sio_port_remove (struct usb_serial_port *port); static int ftdi_open (struct usb_serial_port *port, struct file *filp); static void ftdi_close (struct usb_serial_port *port, struct file *filp); static int ftdi_write (struct usb_serial_port *port, const unsigned char *buf, int count); @@ -631,6 +633,8 @@ static struct usb_serial_driver ftdi_sio_device = { .num_bulk_out = 1, .num_ports = 1, .probe = ftdi_sio_probe, + .port_probe = ftdi_sio_port_probe, + .port_remove = ftdi_sio_port_remove, .open = ftdi_open, .close = ftdi_close, .throttle = ftdi_throttle, @@ -1033,11 +1037,10 @@ static ssize_t show_latency_timer(struct device *dev, struct device_attribute *a { struct usb_serial_port *port = to_usb_serial_port(dev); struct ftdi_private *priv = usb_get_serial_port_data(port); - struct usb_device *udev; + struct usb_device *udev = port->serial->dev; unsigned short latency = 0; int rv = 0; - udev = to_usb_device(dev); dbg("%s",__FUNCTION__); @@ -1061,13 +1064,11 @@ static ssize_t store_latency_timer(struct device *dev, struct device_attribute * { struct usb_serial_port *port = to_usb_serial_port(dev); struct ftdi_private *priv = usb_get_serial_port_data(port); - struct usb_device *udev; + struct usb_device *udev = port->serial->dev; char buf[1]; int v = simple_strtoul(valbuf, NULL, 10); int rv = 0; - udev = to_usb_device(dev); - dbg("%s: setting latency timer = %i", __FUNCTION__, v); rv = usb_control_msg(udev, @@ -1092,13 +1093,11 @@ static ssize_t store_event_char(struct device *dev, struct device_attribute *att { struct usb_serial_port *port = to_usb_serial_port(dev); struct ftdi_private *priv = usb_get_serial_port_data(port); - struct usb_device *udev; + struct usb_device *udev = port->serial->dev; char buf[1]; int v = simple_strtoul(valbuf, NULL, 10); int rv = 0; - udev = to_usb_device(dev); - dbg("%s: setting event char = %i", __FUNCTION__, v); rv = usb_control_msg(udev, @@ -1119,46 +1118,38 @@ static ssize_t store_event_char(struct device *dev, struct device_attribute *att static DEVICE_ATTR(latency_timer, S_IWUSR | S_IRUGO, show_latency_timer, store_latency_timer); static DEVICE_ATTR(event_char, S_IWUSR, NULL, store_event_char); -static int create_sysfs_attrs(struct usb_serial *serial) +static int create_sysfs_attrs(struct usb_serial_port *port) { - struct ftdi_private *priv; - struct usb_device *udev; + struct ftdi_private *priv = usb_get_serial_port_data(port); int retval = 0; dbg("%s",__FUNCTION__); - priv = usb_get_serial_port_data(serial->port[0]); - udev = serial->dev; - /* XXX I've no idea if the original SIO supports the event_char * sysfs parameter, so I'm playing it safe. */ if (priv->chip_type != SIO) { dbg("sysfs attributes for %s", ftdi_chip_name[priv->chip_type]); - retval = device_create_file(&udev->dev, &dev_attr_event_char); + retval = device_create_file(&port->dev, &dev_attr_event_char); if ((!retval) && (priv->chip_type == FT232BM || priv->chip_type == FT2232C)) { - retval = device_create_file(&udev->dev, + retval = device_create_file(&port->dev, &dev_attr_latency_timer); } } return retval; } -static void remove_sysfs_attrs(struct usb_serial *serial) +static void remove_sysfs_attrs(struct usb_serial_port *port) { - struct ftdi_private *priv; - struct usb_device *udev; + struct ftdi_private *priv = usb_get_serial_port_data(port); dbg("%s",__FUNCTION__); - priv = usb_get_serial_port_data(serial->port[0]); - udev = serial->dev; - /* XXX see create_sysfs_attrs */ if (priv->chip_type != SIO) { - device_remove_file(&udev->dev, &dev_attr_event_char); + device_remove_file(&port->dev, &dev_attr_event_char); if (priv->chip_type == FT232BM || priv->chip_type == FT2232C) { - device_remove_file(&udev->dev, &dev_attr_latency_timer); + device_remove_file(&port->dev, &dev_attr_latency_timer); } } @@ -1178,13 +1169,9 @@ static int ftdi_sio_probe (struct usb_serial *serial, const struct usb_device_id return (0); } -/* attach subroutine */ -static int ftdi_sio_attach (struct usb_serial *serial) +static int ftdi_sio_port_probe(struct usb_serial_port *port) { - struct usb_serial_port *port = serial->port[0]; struct ftdi_private *priv; - struct ftdi_sio_quirk *quirk; - int retval; dbg("%s",__FUNCTION__); @@ -1224,19 +1211,21 @@ static int ftdi_sio_attach (struct usb_serial *serial) kfree(port->bulk_out_buffer); port->bulk_out_buffer = NULL; - usb_set_serial_port_data(serial->port[0], priv); + usb_set_serial_port_data(port, priv); - ftdi_determine_type (serial->port[0]); - retval = create_sysfs_attrs(serial); - if (retval) - dev_err(&serial->dev->dev, "Error creating sysfs files, " - "continuing\n"); + ftdi_determine_type (port); + create_sysfs_attrs(port); + return 0; +} +/* attach subroutine */ +static int ftdi_sio_attach (struct usb_serial *serial) +{ /* Check for device requiring special set up. */ - quirk = (struct ftdi_sio_quirk *)usb_get_serial_data(serial); - if (quirk && quirk->setup) { + struct ftdi_sio_quirk *quirk = usb_get_serial_data(serial); + + if (quirk && quirk->setup) quirk->setup(serial); - } return 0; } /* ftdi_sio_attach */ @@ -1280,17 +1269,18 @@ static void ftdi_HE_TIRA1_setup (struct usb_serial *serial) * calls __serial_close for each open of the port * shutdown is called then (ie ftdi_shutdown) */ - - static void ftdi_shutdown (struct usb_serial *serial) -{ /* ftdi_shutdown */ +{ + dbg("%s", __FUNCTION__); +} - struct usb_serial_port *port = serial->port[0]; +static int ftdi_sio_port_remove(struct usb_serial_port *port) +{ struct ftdi_private *priv = usb_get_serial_port_data(port); dbg("%s", __FUNCTION__); - remove_sysfs_attrs(serial); + remove_sysfs_attrs(port); /* all open ports are closed at this point * (by usbserial.c:__serial_close, which calls ftdi_close) @@ -1300,8 +1290,9 @@ static void ftdi_shutdown (struct usb_serial *serial) usb_set_serial_port_data(port, NULL); kfree(priv); } -} /* ftdi_shutdown */ + return 0; +} static int ftdi_open (struct usb_serial_port *port, struct file *filp) { /* ftdi_open */