kfifo: rename kfifo_put... into kfifo_in... and kfifo_get... into kfifo_out...

rename kfifo_put...  into kfifo_in...  to prevent miss use of old non in
kernel-tree drivers

ditto for kfifo_get...  -> kfifo_out...

Improve the prototypes of kfifo_in and kfifo_out to make the kerneldoc
annotations more readable.

Add mini "howto porting to the new API" in kfifo.h

Signed-off-by: Stefani Seibold <stefani@seibold.net>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Acked-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/usb/host/fhci.h b/drivers/usb/host/fhci.h
index 96aa787..72dae1c 100644
--- a/drivers/usb/host/fhci.h
+++ b/drivers/usb/host/fhci.h
@@ -510,14 +510,14 @@
 
 static inline int cq_put(struct kfifo *kfifo, void *p)
 {
-	return kfifo_put(kfifo, (void *)&p, sizeof(p));
+	return kfifo_in(kfifo, (void *)&p, sizeof(p));
 }
 
 static inline void *cq_get(struct kfifo *kfifo)
 {
 	void *p = NULL;
 
-	kfifo_get(kfifo, (void *)&p, sizeof(p));
+	kfifo_out(kfifo, (void *)&p, sizeof(p));
 	return p;
 }
 
diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c
index d0a2e46..b0f1183 100644
--- a/drivers/usb/serial/generic.c
+++ b/drivers/usb/serial/generic.c
@@ -285,7 +285,7 @@
 		return 0;
 
 	data = port->write_urb->transfer_buffer;
-	count = kfifo_get_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 @@
 		return usb_serial_multi_urb_write(tty, port,
 						  buf, count);
 
-	count = kfifo_put_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)