USB: ssu100: remove max_packet_size calculation

The max_packet_size logic is taken from ftdi_sio, but it's not needed
for this device.  This also makes proces_read_urb simpler.

Signed-off-by: Bill Pemberton <wfp5p@virginia.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 8 insertions, 48 deletions

diff --git a/drivers/usb/serial/ssu100.c b/drivers/usb/serial/ssu100.c
index f5312dd3331b..8359ec798959 100644
--- a/drivers/usb/serial/ssu100.c
+++ b/drivers/usb/serial/ssu100.c
@@ -79,7 +79,6 @@ struct ssu100_port_private {
         u8 shadowLSR;
         u8 shadowMSR;
         wait_queue_head_t delta_msr_wait; /* Used for TIOCMIWAIT */
-        unsigned short max_packet_size;
         struct async_icount icount;
 };
 
@@ -464,36 +463,6 @@ static int ssu100_ioctl(struct tty_struct *tty, struct file *file,
         return -ENOIOCTLCMD;
 }
 
-static void ssu100_set_max_packet_size(struct usb_serial_port *port)
-{
-        struct ssu100_port_private *priv = usb_get_serial_port_data(port);
-        struct usb_serial *serial = port->serial;
-        struct usb_device *udev = serial->dev;
-
-        struct usb_interface *interface = serial->interface;
-        struct usb_endpoint_descriptor *ep_desc = &interface->cur_altsetting->endpoint[1].desc;
-
-        unsigned num_endpoints;
-        int i;
-        unsigned long flags;
-
-        num_endpoints = interface->cur_altsetting->desc.bNumEndpoints;
-        dev_info(&udev->dev, "Number of endpoints %d\n", num_endpoints);
-
-        for (i = 0; i < num_endpoints; i++) {
-                dev_info(&udev->dev, "Endpoint %d MaxPacketSize %d\n", i+1,
-                        interface->cur_altsetting->endpoint[i].desc.wMaxPacketSize);
-                ep_desc = &interface->cur_altsetting->endpoint[i].desc;
-        }
-
-        /* set max packet size based on descriptor */
-        spin_lock_irqsave(&priv->status_lock, flags);
-        priv->max_packet_size = ep_desc->wMaxPacketSize;
-        spin_unlock_irqrestore(&priv->status_lock, flags);
-
-        dev_info(&udev->dev, "Setting MaxPacketSize %d\n", priv->max_packet_size);
-}
-
 static int ssu100_attach(struct usb_serial *serial)
 {
         struct ssu100_port_private *priv;
@@ -511,7 +480,6 @@ static int ssu100_attach(struct usb_serial *serial)
         spin_lock_init(&priv->status_lock);
         init_waitqueue_head(&priv->delta_msr_wait);
         usb_set_serial_port_data(port, priv);
-        ssu100_set_max_packet_size(port);
 
         return ssu100_initdevice(serial->dev);
 }
@@ -641,13 +609,14 @@ static void ssu100_update_lsr(struct usb_serial_port *port, u8 lsr,
 
 }
 
-static int ssu100_process_packet(struct tty_struct *tty,
-                                 struct usb_serial_port *port,
-                                 struct ssu100_port_private *priv,
-                                 char *packet, int len)
+static int ssu100_process_packet(struct urb *urb,
+                                 struct tty_struct *tty)
 {
-        int i;
+        struct usb_serial_port *port = urb->context;
+        char *packet = (char *)urb->transfer_buffer;
         char flag = TTY_NORMAL;
+        u32 len = urb->actual_length;
+        int i;
         char *ch;
 
         dbg("%s - port %d", __func__, port->number);
@@ -685,12 +654,8 @@ static int ssu100_process_packet(struct tty_struct *tty,
 static void ssu100_process_read_urb(struct urb *urb)
 {
         struct usb_serial_port *port = urb->context;
-        struct ssu100_port_private *priv = usb_get_serial_port_data(port);
-        char *data = (char *)urb->transfer_buffer;
         struct tty_struct *tty;
-        int count = 0;
-        int i;
-        int len;
+        int count;
 
         dbg("%s", __func__);
 
@@ -698,10 +663,7 @@ static void ssu100_process_read_urb(struct urb *urb)
         if (!tty)
                 return;
 
-        for (i = 0; i < urb->actual_length; i += priv->max_packet_size) {
-                len = min_t(int, urb->actual_length - i, priv->max_packet_size);
-                count += ssu100_process_packet(tty, port, priv, &data[i], len);
-        }
+        count = ssu100_process_packet(urb, tty);
 
         if (count)
                 tty_flip_buffer_push(tty);
@@ -717,8 +679,6 @@ static struct usb_serial_driver ssu100_device = {
         .id_table            = id_table,
         .usb_driver          = &ssu100_driver,
         .num_ports           = 1,
-        .bulk_in_size        = 256,
-        .bulk_out_size       = 256,
         .open                = ssu100_open,
         .close               = ssu100_close,
         .attach              = ssu100_attach,