Fix usb_serial_probe() problem introduced by the recent kfifo changes

The USB serial code was a new user of the kfifo API, and it was missed
when porting things to the new kfifo API.

Please make the write_fifo in place.  Here is my patch to fix the
regression and full ported version.

Signed-off-by: Stefani Seibold <stefani@seibold.net>
Reported-and-tested-by: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Greg KH <greg@kroah.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c
index b0f1183..f1ea3a3 100644 (file)
--- a/drivers/usb/serial/generic.c
+++ b/drivers/usb/serial/generic.c
@@ -276,7 +276,7 @@ static int usb_serial_generic_write_start(struct usb_serial_port *port)
        if (port->write_urb_busy)
                start_io = false;
        else {
-               start_io = (kfifo_len(port->write_fifo) != 0);
+               start_io = (kfifo_len(&port->write_fifo) != 0);
                port->write_urb_busy = start_io;
        }
        spin_unlock_irqrestore(&port->lock, flags);
@@ -285,7 +285,7 @@ static int usb_serial_generic_write_start(struct usb_serial_port *port)
                return 0;
 
        data = port->write_urb->transfer_buffer;
-       count = kfifo_out_locked(port->write_fifo, data, port->bulk_out_size, &port->lock);
+       count = kfifo_out_locked(&port->write_fifo, data, port->bulk_out_size, &port->lock);
        usb_serial_debug_data(debug, &port->dev, __func__, count, data);
 
        /* set up our urb */
@@ -345,7 +345,7 @@ int usb_serial_generic_write(struct tty_struct *tty,
                return usb_serial_multi_urb_write(tty, port,
                                                  buf, count);
 
-       count = kfifo_in_locked(port->write_fifo, buf, count, &port->lock);
+       count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock);
        result = usb_serial_generic_write_start(port);
 
        if (result >= 0)
@@ -370,7 +370,7 @@ int usb_serial_generic_write_room(struct tty_struct *tty)
                                (serial->type->max_in_flight_urbs -
                                 port->urbs_in_flight);
        } else if (serial->num_bulk_out)
-               room = port->write_fifo->size - kfifo_len(port->write_fifo);
+               room = kfifo_avail(&port->write_fifo);
        spin_unlock_irqrestore(&port->lock, flags);
 
        dbg("%s - returns %d", __func__, room);
@@ -391,7 +391,7 @@ int usb_serial_generic_chars_in_buffer(struct tty_struct *tty)
                chars = port->tx_bytes_flight;
                spin_unlock_irqrestore(&port->lock, flags);
        } else if (serial->num_bulk_out)
-               chars = kfifo_len(port->write_fifo);
+               chars = kfifo_len(&port->write_fifo);
 
        dbg("%s - returns %d", __func__, chars);
        return chars;
@@ -507,7 +507,7 @@ void usb_serial_generic_write_bulk_callback(struct urb *urb)
                if (status) {
                        dbg("%s - nonzero multi-urb write bulk status "
                                "received: %d", __func__, status);
-                       kfifo_reset(port->write_fifo);
+                       kfifo_reset_out(&port->write_fifo);
                } else
                        usb_serial_generic_write_start(port);
        }

diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 636a4f2..33c85f7 100644 (file)
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -595,8 +595,7 @@ static void port_release(struct device *dev)
        usb_free_urb(port->write_urb);
        usb_free_urb(port->interrupt_in_urb);
        usb_free_urb(port->interrupt_out_urb);
-       if (!IS_ERR(port->write_fifo) && port->write_fifo)
-               kfifo_free(port->write_fifo);
+       kfifo_free(&port->write_fifo);
        kfree(port->bulk_in_buffer);
        kfree(port->bulk_out_buffer);
        kfree(port->interrupt_in_buffer);
@@ -939,7 +938,7 @@ int usb_serial_probe(struct usb_interface *interface,
                        dev_err(&interface->dev, "No free urbs available\n");
                        goto probe_error;
                }
-               if (kfifo_alloc(port->write_fifo, PAGE_SIZE, GFP_KERNEL))
+               if (kfifo_alloc(&port->write_fifo, PAGE_SIZE, GFP_KERNEL))
                        goto probe_error;
                buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
                port->bulk_out_size = buffer_size;

diff --git a/include/linux/usb/serial.h b/include/linux/usb/serial.h
index acf6e45..1819396 100644 (file)
--- a/include/linux/usb/serial.h
+++ b/include/linux/usb/serial.h
@@ -16,6 +16,7 @@
 #include <linux/kref.h>
 #include <linux/mutex.h>
 #include <linux/sysrq.h>
+#include <linux/kfifo.h>
 
 #define SERIAL_TTY_MAJOR       188     /* Nice legal number now */
 #define SERIAL_TTY_MINORS      254     /* loads of devices :) */
@@ -94,7 +95,7 @@ struct usb_serial_port {
        unsigned char           *bulk_out_buffer;
        int                     bulk_out_size;
        struct urb              *write_urb;
-       struct kfifo            *write_fifo;
+       struct kfifo            write_fifo;
        int                     write_urb_busy;
        __u8                    bulk_out_endpointAddress;