Use the port interrupt-out urb rather than abusing the port write_urb
pointer and allocating a new urb at every open (but the first...).
Note that the write_urb abuse would have led to a double free should
there ever be interfaces with a bulk-out endpoint.
Signed-off-by: Johan Hovold <jhovold@xxxxxxxxx>
---
drivers/usb/serial/kobil_sct.c | 75 +++++-------------------------------------
1 file changed, 8 insertions(+), 67 deletions(-)
diff --git a/drivers/usb/serial/kobil_sct.c b/drivers/usb/serial/kobil_sct.c
index 5bcfd57..78b48c3 100644
--- a/drivers/usb/serial/kobil_sct.c
+++ b/drivers/usb/serial/kobil_sct.c
@@ -65,7 +65,7 @@ static int kobil_tiocmget(struct tty_struct *tty);
static int kobil_tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear);
static void kobil_read_int_callback(struct urb *urb);
-static void kobil_write_callback(struct urb *purb);
+static void kobil_write_int_callback(struct urb *urb);
static void kobil_set_termios(struct tty_struct *tty,
struct usb_serial_port *port, struct ktermios *old);
static void kobil_init_termios(struct tty_struct *tty);
@@ -99,6 +99,7 @@ static struct usb_serial_driver kobil_device = {
.write = kobil_write,
.write_room = kobil_write_room,
.read_int_callback = kobil_read_int_callback,
+ .write_int_callback = kobil_write_int_callback,
};
static struct usb_serial_driver * const serial_drivers[] = {
@@ -106,7 +107,6 @@ static struct usb_serial_driver * const serial_drivers[] = {
};
struct kobil_private {
- int write_int_endpoint_address;
unsigned char buf[KOBIL_BUF_LENGTH]; /* buffer for the APDU to send */
int filled; /* index of the last char in buf */
int cur_pos; /* index of the next char to send in buf */
@@ -116,14 +116,8 @@ struct kobil_private {
static int kobil_port_probe(struct usb_serial_port *port)
{
- int i;
struct usb_serial *serial = port->serial;
struct kobil_private *priv;
- struct usb_device *pdev;
- struct usb_host_config *actconfig;
- struct usb_interface *interface;
- struct usb_host_interface *altsetting;
- struct usb_host_endpoint *endpoint;
priv = kmalloc(sizeof(struct kobil_private), GFP_KERNEL);
if (!priv)
@@ -149,23 +143,6 @@ static int kobil_port_probe(struct usb_serial_port *port)
}
usb_set_serial_port_data(port, priv);
- /* search for the necessary endpoints */
- pdev = serial->dev;
- actconfig = pdev->actconfig;
- interface = actconfig->interface[0];
- altsetting = interface->cur_altsetting;
- endpoint = altsetting->endpoint;
-
- for (i = 0; i < altsetting->desc.bNumEndpoints; i++) {
- endpoint = &altsetting->endpoint[i];
- if (usb_endpoint_is_int_out(&endpoint->desc)) {
- dev_dbg(&serial->dev->dev,
- "%s Found interrupt out endpoint. Address: %d\n",
- __func__, endpoint->desc.bEndpointAddress);
- priv->write_int_endpoint_address =
- endpoint->desc.bEndpointAddress;
- }
- }
return 0;
}
@@ -197,7 +174,6 @@ static int kobil_open(struct tty_struct *tty, struct usb_serial_port *port)
struct kobil_private *priv;
unsigned char *transfer_buffer;
int transfer_buffer_length = 8;
- int write_urb_transfer_buffer_length = 8;
priv = usb_get_serial_port_data(port);
@@ -206,27 +182,6 @@ static int kobil_open(struct tty_struct *tty, struct usb_serial_port *port)
if (!transfer_buffer)
return -ENOMEM;
- /* allocate write_urb */
- if (!port->write_urb) {
- dev_dbg(dev, "%s - Allocating port->write_urb\n", __func__);
- port->write_urb = usb_alloc_urb(0, GFP_KERNEL);
- if (!port->write_urb) {
- dev_dbg(dev, "%s - usb_alloc_urb failed\n", __func__);
- kfree(transfer_buffer);
- return -ENOMEM;
- }
- }
-
- /* allocate memory for write_urb transfer buffer */
- port->write_urb->transfer_buffer =
- kmalloc(write_urb_transfer_buffer_length, GFP_KERNEL);
- if (!port->write_urb->transfer_buffer) {
- kfree(transfer_buffer);
- usb_free_urb(port->write_urb);
- port->write_urb = NULL;
- return -ENOMEM;
- }
-
/* get hardware version */
result = usb_control_msg(port->serial->dev,
usb_rcvctrlpipe(port->serial->dev, 0),
@@ -302,12 +257,7 @@ static int kobil_open(struct tty_struct *tty, struct usb_serial_port *port)
static void kobil_close(struct usb_serial_port *port)
{
/* FIXME: Add rts/dtr methods */
- if (port->write_urb) {
- usb_poison_urb(port->write_urb);
- kfree(port->write_urb->transfer_buffer);
- usb_free_urb(port->write_urb);
- port->write_urb = NULL;
- }
+ usb_kill_urb(port->interrupt_out_urb);
usb_kill_urb(port->interrupt_in_urb);
}
@@ -336,7 +286,7 @@ static void kobil_read_int_callback(struct urb *urb)
}
-static void kobil_write_callback(struct urb *purb)
+static void kobil_write_int_callback(struct urb *urb)
{
}
@@ -379,23 +329,14 @@ static int kobil_write(struct tty_struct *tty, struct usb_serial_port *port,
while (todo > 0) {
/* max 8 byte in one urb (endpoint size) */
- length = (todo < 8) ? todo : 8;
+ length = min(todo, port->interrupt_out_size);
/* copy data to transfer buffer */
- memcpy(port->write_urb->transfer_buffer,
+ memcpy(port->interrupt_out_buffer,
priv->buf + priv->cur_pos, length);
- usb_fill_int_urb(port->write_urb,
- port->serial->dev,
- usb_sndintpipe(port->serial->dev,
- priv->write_int_endpoint_address),
- port->write_urb->transfer_buffer,
- length,
- kobil_write_callback,
- port,
- 8
- );
+ port->interrupt_out_urb->transfer_buffer_length = length;
priv->cur_pos = priv->cur_pos + length;
- result = usb_submit_urb(port->write_urb, GFP_NOIO);
+ result = usb_submit_urb(port->interrupt_out_urb, GFP_NOIO);
dev_dbg(&port->dev, "%s - Send write URB returns: %i\n", __func__, result);
todo = priv->filled - priv->cur_pos;
--
1.8.1.5
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