ieee1394: remove usage of skb_queue as packet queue

This considerably reduces the memory requirements for a packet and
eliminates ieee1394's dependency on CONFIG_NET.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

drivers/ieee1394/Kconfig

@@ -5,7 +5,6 @@ menu "IEEE 1394 (FireWire) support"
 config IEEE1394
 	tristate "IEEE 1394 (FireWire) support"
 	depends on PCI || BROKEN
-	select NET
 	help
 	  IEEE 1394 describes a high performance serial bus, which is also
 	  known as FireWire(tm) or i.Link(tm) and is used for connecting all

drivers/ieee1394/hosts.c

@@ -94,14 +94,6 @@ static int alloc_hostnum_cb(struct hpsb_host *host, void *__data)
 	return 0;
 }
 
-/*
- * The pending_packet_queue is special in that it's processed
- * from hardirq context too (such as hpsb_bus_reset()). Hence
- * split the lock class from the usual networking skb-head
- * lock class by using a separate key for it:
- */
-static struct lock_class_key pending_packet_queue_key;
-
 static DEFINE_MUTEX(host_num_alloc);
 
 /**
@@ -137,9 +129,7 @@ struct hpsb_host *hpsb_alloc_host(struct hpsb_host_driver *drv, size_t extra,
 	h->hostdata = h + 1;
 	h->driver = drv;
 
-	skb_queue_head_init(&h->pending_packet_queue);
-	lockdep_set_class(&h->pending_packet_queue.lock,
-			   &pending_packet_queue_key);
+	INIT_LIST_HEAD(&h->pending_packets);
 	INIT_LIST_HEAD(&h->addr_space);
 
 	for (i = 2; i < 16; i++)

drivers/ieee1394/hosts.h

@@ -3,7 +3,6 @@
 
 #include <linux/device.h>
 #include <linux/list.h>
-#include <linux/skbuff.h>
 #include <linux/timer.h>
 #include <linux/types.h>
 #include <linux/workqueue.h>
@@ -25,8 +24,7 @@ struct hpsb_host {
 
 	atomic_t generation;
 
-	struct sk_buff_head pending_packet_queue;
-
+	struct list_head pending_packets;
 	struct timer_list timeout;
 	unsigned long timeout_interval;
 

drivers/ieee1394/ieee1394_core.h

@@ -4,7 +4,6 @@
 #include <linux/device.h>
 #include <linux/fs.h>
 #include <linux/list.h>
-#include <linux/skbuff.h>
 #include <linux/types.h>
 #include <asm/atomic.h>
 
@@ -13,7 +12,7 @@
 
 struct hpsb_packet {
 	/* This struct is basically read-only for hosts with the exception of
-	 * the data buffer contents and xnext - see below. */
+	 * the data buffer contents and driver_list. */
 
 	/* This can be used for host driver internal linking.
 	 *
@@ -49,35 +48,27 @@ struct hpsb_packet {
 	/* Speed to transmit with: 0 = 100Mbps, 1 = 200Mbps, 2 = 400Mbps */
 	unsigned speed_code:2;
 
-	/*
-	 * *header and *data are guaranteed to be 32-bit DMAable and may be
-	 * overwritten to allow in-place byte swapping.  Neither of these is
-	 * CRCed (the sizes also don't include CRC), but contain space for at
-	 * least one additional quadlet to allow in-place CRCing.  The memory is
-	 * also guaranteed to be DMA mappable.
-	 */
-	quadlet_t *header;
-	quadlet_t *data;
-	size_t header_size;
-	size_t data_size;
-
 	struct hpsb_host *host;
 	unsigned int generation;
 
 	atomic_t refcnt;
+	struct list_head queue;
 
 	/* Function (and possible data to pass to it) to call when this
 	 * packet is completed.  */
 	void (*complete_routine)(void *);
 	void *complete_data;
 
-	/* XXX This is just a hack at the moment */
-	struct sk_buff *skb;
-
 	/* Store jiffies for implementing bus timeouts. */
 	unsigned long sendtime;
 
-	quadlet_t embedded_header[5];
+	/* Sizes are in bytes. *data can be DMA-mapped. */
+	size_t allocated_data_size;	/* as allocated */
+	size_t data_size;		/* as filled in */
+	size_t header_size;		/* as filled in, not counting the CRC */
+	quadlet_t *data;
+	quadlet_t header[5];
+	quadlet_t embedded_data[0];	/* keep as last member */
 };
 
 void hpsb_set_packet_complete_task(struct hpsb_packet *packet,

drivers/ieee1394/raw1394.c

@@ -938,7 +938,8 @@ static int handle_async_send(struct file_info *fi, struct pending_request *req)
 	int header_length = req->req.misc & 0xffff;
 	int expect_response = req->req.misc >> 16;
 
-	if ((header_length > req->req.length) || (header_length < 12)) {
+	if (header_length > req->req.length || header_length < 12 ||
+	    header_length > FIELD_SIZEOF(struct hpsb_packet, header)) {
 		req->req.error = RAW1394_ERROR_INVALID_ARG;
 		req->req.length = 0;
 		queue_complete_req(req);