USB: safe_serial: reimplement read using generic framework

Use process_read_urb to implement read processing.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 8 insertions, 39 deletions

diff --git a/drivers/usb/serial/safe_serial.c b/drivers/usb/serial/safe_serial.c
index 915c094ef92c..d9af5c5ed9e8 100644
--- a/drivers/usb/serial/safe_serial.c
+++ b/drivers/usb/serial/safe_serial.c
@@ -213,38 +213,20 @@ static __u16 __inline__ fcs_compute10(unsigned char *sp, int len, __u16 fcs)
         return fcs;
 }
 
-static void safe_read_bulk_callback(struct urb *urb)
+static void safe_process_read_urb(struct urb *urb)
 {
-        struct usb_serial_port *port =  urb->context;
+        struct usb_serial_port *port = urb->context;
         unsigned char *data = urb->transfer_buffer;
         unsigned char length = urb->actual_length;
         struct tty_struct *tty;
-        int result;
-        int status = urb->status;
 
-        dbg("%s", __func__);
-
-        if (status) {
-                dbg("%s - nonzero read bulk status received: %d",
-                    __func__, status);
+        if (!length)
                 return;
-        }
 
-        dbg("safe_read_bulk_callback length: %d",
-                                        port->read_urb->actual_length);
-#ifdef ECHO_RCV
-        {
-                int i;
-                unsigned char *cp = port->read_urb->transfer_buffer;
-                for (i = 0; i < port->read_urb->actual_length; i++) {
-                        if ((i % 32) == 0)
-                                printk("\nru[%02x] ", i);
-                        printk("%02x ", *cp++);
-                }
-                printk("\n");
-        }
-#endif
         tty = tty_port_tty_get(&port->port);
+        if (!tty)
+                return;
+
         if (safe) {
                 __u16 fcs;
                 fcs = fcs_compute10(data, length, CRC10_INITFCS);
@@ -268,21 +250,8 @@ static void safe_read_bulk_callback(struct urb *urb)
                 tty_insert_flip_string(tty, data, length);
                 tty_flip_buffer_push(tty);
         }
-        tty_kref_put(tty);
 
-        /* Continue trying to always read  */
-        usb_fill_bulk_urb(urb, port->serial->dev,
-                        usb_rcvbulkpipe(port->serial->dev,
-                                        port->bulk_in_endpointAddress),
-                        urb->transfer_buffer, urb->transfer_buffer_length,
-                        safe_read_bulk_callback, port);
-
-        result = usb_submit_urb(urb, GFP_ATOMIC);
-        if (result)
-                dev_err(&port->dev,
-                        "%s - failed resubmitting read urb, error %d\n",
-                        __func__, result);
-                /* FIXME: Need a mechanism to retry later if this happens */
+        tty_kref_put(tty);
 }
 
 static int safe_prepare_write_buffer(struct usb_serial_port *port,
@@ -343,7 +312,7 @@ static struct usb_serial_driver safe_device = {
         .id_table =             id_table,
         .usb_driver =           &safe_driver,
         .num_ports =            1,
-        .read_bulk_callback =   safe_read_bulk_callback,
+        .process_read_urb =     safe_process_read_urb,
         .prepare_write_buffer = safe_prepare_write_buffer,
         .attach =               safe_startup,
 };