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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>
This commit is contained in:
Stefan Richter 2007-03-25 22:22:40 +02:00
parent d265250341
commit 7542e0e696
6 changed files with 163 additions and 169 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/ieee1394/Kconfig
View File

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

12
drivers/ieee1394/hosts.c
View File

@ -94,14 +94,6 @@ static int alloc_hostnum_cb(struct hpsb_host *host, void *__data)
return 0; 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); 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->hostdata = h + 1;
h->driver = drv; h->driver = drv;
skb_queue_head_init(&h->pending_packet_queue); INIT_LIST_HEAD(&h->pending_packets);
lockdep_set_class(&h->pending_packet_queue.lock,
&pending_packet_queue_key);
INIT_LIST_HEAD(&h->addr_space); INIT_LIST_HEAD(&h->addr_space);
for (i = 2; i < 16; i++) for (i = 2; i < 16; i++)

4
drivers/ieee1394/hosts.h
View File

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

277
drivers/ieee1394/ieee1394_core.c
View File

@ -30,7 +30,6 @@
#include <linux/moduleparam.h> #include <linux/moduleparam.h>
#include <linux/bitops.h> #include <linux/bitops.h>
#include <linux/kdev_t.h> #include <linux/kdev_t.h>
#include <linux/skbuff.h>
#include <linux/suspend.h> #include <linux/suspend.h>
#include <linux/kthread.h> #include <linux/kthread.h>
#include <linux/preempt.h> #include <linux/preempt.h>
@ -103,6 +102,8 @@ static void queue_packet_complete(struct hpsb_packet *packet);
* *
* Set the task that runs when a packet completes. You cannot call this more * Set the task that runs when a packet completes. You cannot call this more
* than once on a single packet before it is sent. * than once on a single packet before it is sent.
*
* Typically, the complete @routine is responsible to call hpsb_free_packet().
*/ */
void hpsb_set_packet_complete_task(struct hpsb_packet *packet, void hpsb_set_packet_complete_task(struct hpsb_packet *packet,
void (*routine)(void *), void *data) void (*routine)(void *), void *data)
@ -115,12 +116,12 @@ void hpsb_set_packet_complete_task(struct hpsb_packet *packet,
/** /**
* hpsb_alloc_packet - allocate new packet structure * hpsb_alloc_packet - allocate new packet structure
* @data_size: size of the data block to be allocated * @data_size: size of the data block to be allocated, in bytes
* *
* This function allocates, initializes and returns a new &struct hpsb_packet. * This function allocates, initializes and returns a new &struct hpsb_packet.
* It can be used in interrupt context. A header block is always included, its * It can be used in interrupt context. A header block is always included and
* size is big enough to contain all possible 1394 headers. The data block is * initialized with zeros. Its size is big enough to contain all possible 1394
* only allocated when @data_size is not zero. * headers. The data block is only allocated if @data_size is not zero.
* *
* For packets for which responses will be received the @data_size has to be big * For packets for which responses will be received the @data_size has to be big
* enough to contain the response's data block since no further allocation * enough to contain the response's data block since no further allocation
@ -135,50 +136,42 @@ void hpsb_set_packet_complete_task(struct hpsb_packet *packet,
*/ */
struct hpsb_packet *hpsb_alloc_packet(size_t data_size) struct hpsb_packet *hpsb_alloc_packet(size_t data_size)
{ {
struct hpsb_packet *packet = NULL; struct hpsb_packet *packet;
struct sk_buff *skb;
data_size = ((data_size + 3) & ~3); data_size = ((data_size + 3) & ~3);
skb = alloc_skb(data_size + sizeof(*packet), GFP_ATOMIC); packet = kzalloc(sizeof(*packet) + data_size, GFP_ATOMIC);
if (skb == NULL) if (!packet)
return NULL; return NULL;
memset(skb->data, 0, data_size + sizeof(*packet));
packet = (struct hpsb_packet *)skb->data;
packet->skb = skb;
packet->header = packet->embedded_header;
packet->state = hpsb_unused; packet->state = hpsb_unused;
packet->generation = -1; packet->generation = -1;
INIT_LIST_HEAD(&packet->driver_list); INIT_LIST_HEAD(&packet->driver_list);
INIT_LIST_HEAD(&packet->queue);
atomic_set(&packet->refcnt, 1); atomic_set(&packet->refcnt, 1);
if (data_size) { if (data_size) {
packet->data = (quadlet_t *)(skb->data + sizeof(*packet)); packet->data = packet->embedded_data;
packet->data_size = data_size; packet->allocated_data_size = data_size;
} }
return packet; return packet;
} }
/** /**
* hpsb_free_packet - free packet and data associated with it * hpsb_free_packet - free packet and data associated with it
* @packet: packet to free (is NULL safe) * @packet: packet to free (is NULL safe)
* *
* This function will free packet->data and finally the packet itself. * Frees @packet->data only if it was allocated through hpsb_alloc_packet().
*/ */
void hpsb_free_packet(struct hpsb_packet *packet) void hpsb_free_packet(struct hpsb_packet *packet)
{ {
if (packet && atomic_dec_and_test(&packet->refcnt)) { if (packet && atomic_dec_and_test(&packet->refcnt)) {
BUG_ON(!list_empty(&packet->driver_list)); BUG_ON(!list_empty(&packet->driver_list) ||
kfree_skb(packet->skb); !list_empty(&packet->queue));
kfree(packet);
} }
} }
/** /**
* hpsb_reset_bus - initiate bus reset on the given host * hpsb_reset_bus - initiate bus reset on the given host
* @host: host controller whose bus to reset * @host: host controller whose bus to reset
@ -494,6 +487,8 @@ void hpsb_selfid_complete(struct hpsb_host *host, int phyid, int isroot)
highlevel_host_reset(host); highlevel_host_reset(host);
} }
static spinlock_t pending_packets_lock = SPIN_LOCK_UNLOCKED;
/** /**
* hpsb_packet_sent - notify core of sending a packet * hpsb_packet_sent - notify core of sending a packet
* *
@ -509,24 +504,24 @@ void hpsb_packet_sent(struct hpsb_host *host, struct hpsb_packet *packet,
{ {
unsigned long flags; unsigned long flags;
spin_lock_irqsave(&host->pending_packet_queue.lock, flags); spin_lock_irqsave(&pending_packets_lock, flags);
packet->ack_code = ackcode; packet->ack_code = ackcode;
if (packet->no_waiter || packet->state == hpsb_complete) { if (packet->no_waiter || packet->state == hpsb_complete) {
/* if packet->no_waiter, must not have a tlabel allocated */ /* if packet->no_waiter, must not have a tlabel allocated */
spin_unlock_irqrestore(&host->pending_packet_queue.lock, flags); spin_unlock_irqrestore(&pending_packets_lock, flags);
hpsb_free_packet(packet); hpsb_free_packet(packet);
return; return;
} }
atomic_dec(&packet->refcnt); /* drop HC's reference */ atomic_dec(&packet->refcnt); /* drop HC's reference */
/* here the packet must be on the host->pending_packet_queue */ /* here the packet must be on the host->pending_packets queue */
if (ackcode != ACK_PENDING || !packet->expect_response) { if (ackcode != ACK_PENDING || !packet->expect_response) {
packet->state = hpsb_complete; packet->state = hpsb_complete;
__skb_unlink(packet->skb, &host->pending_packet_queue); list_del_init(&packet->queue);
spin_unlock_irqrestore(&host->pending_packet_queue.lock, flags); spin_unlock_irqrestore(&pending_packets_lock, flags);
queue_packet_complete(packet); queue_packet_complete(packet);
return; return;
} }
@ -534,7 +529,7 @@ void hpsb_packet_sent(struct hpsb_host *host, struct hpsb_packet *packet,
packet->state = hpsb_pending; packet->state = hpsb_pending;
packet->sendtime = jiffies; packet->sendtime = jiffies;
spin_unlock_irqrestore(&host->pending_packet_queue.lock, flags); spin_unlock_irqrestore(&pending_packets_lock, flags);
mod_timer(&host->timeout, jiffies + host->timeout_interval); mod_timer(&host->timeout, jiffies + host->timeout_interval);
} }
@ -609,12 +604,16 @@ int hpsb_send_packet(struct hpsb_packet *packet)
WARN_ON(packet->no_waiter && packet->expect_response); WARN_ON(packet->no_waiter && packet->expect_response);
if (!packet->no_waiter || packet->expect_response) { if (!packet->no_waiter || packet->expect_response) {
unsigned long flags;
atomic_inc(&packet->refcnt); atomic_inc(&packet->refcnt);
/* Set the initial "sendtime" to 10 seconds from now, to /* Set the initial "sendtime" to 10 seconds from now, to
prevent premature expiry. If a packet takes more than prevent premature expiry. If a packet takes more than
10 seconds to hit the wire, we have bigger problems :) */ 10 seconds to hit the wire, we have bigger problems :) */
packet->sendtime = jiffies + 10 * HZ; packet->sendtime = jiffies + 10 * HZ;
skb_queue_tail(&host->pending_packet_queue, packet->skb); spin_lock_irqsave(&pending_packets_lock, flags);
list_add_tail(&packet->queue, &host->pending_packets);
spin_unlock_irqrestore(&pending_packets_lock, flags);
} }
if (packet->node_id == host->node_id) { if (packet->node_id == host->node_id) {
@ -690,86 +689,97 @@ static void send_packet_nocare(struct hpsb_packet *packet)
} }
} }
static size_t packet_size_to_data_size(size_t packet_size, size_t header_size,
size_t buffer_size, int tcode)
{
size_t ret = packet_size <= header_size ? 0 : packet_size - header_size;
if (unlikely(ret > buffer_size))
ret = buffer_size;
if (unlikely(ret + header_size != packet_size))
HPSB_ERR("unexpected packet size %d (tcode %d), bug?",
packet_size, tcode);
return ret;
}
static void handle_packet_response(struct hpsb_host *host, int tcode, static void handle_packet_response(struct hpsb_host *host, int tcode,
quadlet_t *data, size_t size) quadlet_t *data, size_t size)
{ {
struct hpsb_packet *packet = NULL; struct hpsb_packet *packet;
struct sk_buff *skb; int tlabel = (data[0] >> 10) & 0x3f;
int tcode_match = 0; size_t header_size;
int tlabel;
unsigned long flags; unsigned long flags;
tlabel = (data[0] >> 10) & 0x3f; spin_lock_irqsave(&pending_packets_lock, flags);
spin_lock_irqsave(&host->pending_packet_queue.lock, flags); list_for_each_entry(packet, &host->pending_packets, queue)
if (packet->tlabel == tlabel &&
packet->node_id == (data[1] >> 16))
goto found;
skb_queue_walk(&host->pending_packet_queue, skb) { spin_unlock_irqrestore(&pending_packets_lock, flags);
packet = (struct hpsb_packet *)skb->data; HPSB_DEBUG("unsolicited response packet received - %s",
if ((packet->tlabel == tlabel) "no tlabel match");
&& (packet->node_id == (data[1] >> 16))){
break;
}
packet = NULL;
}
if (packet == NULL) {
HPSB_DEBUG("unsolicited response packet received - no tlabel match");
dump_packet("contents", data, 16, -1); dump_packet("contents", data, 16, -1);
spin_unlock_irqrestore(&host->pending_packet_queue.lock, flags);
return; return;
}
found:
switch (packet->tcode) { switch (packet->tcode) {
case TCODE_WRITEQ: case TCODE_WRITEQ:
case TCODE_WRITEB: case TCODE_WRITEB:
if (tcode != TCODE_WRITE_RESPONSE) if (unlikely(tcode != TCODE_WRITE_RESPONSE))
break;
tcode_match = 1;
memcpy(packet->header, data, 12);
break; break;
header_size = 12;
size = 0;
goto dequeue;
case TCODE_READQ: case TCODE_READQ:
if (tcode != TCODE_READQ_RESPONSE) if (unlikely(tcode != TCODE_READQ_RESPONSE))
break;
tcode_match = 1;
memcpy(packet->header, data, 16);
break; break;
header_size = 16;
size = 0;
goto dequeue;
case TCODE_READB: case TCODE_READB:
if (tcode != TCODE_READB_RESPONSE) if (unlikely(tcode != TCODE_READB_RESPONSE))
break;
tcode_match = 1;
BUG_ON(packet->skb->len - sizeof(*packet) < size - 16);
memcpy(packet->header, data, 16);
memcpy(packet->data, data + 4, size - 16);
break; break;
header_size = 16;
size = packet_size_to_data_size(size, header_size,
packet->allocated_data_size,
tcode);
goto dequeue;
case TCODE_LOCK_REQUEST: case TCODE_LOCK_REQUEST:
if (tcode != TCODE_LOCK_RESPONSE) if (unlikely(tcode != TCODE_LOCK_RESPONSE))
break;
tcode_match = 1;
size = min((size - 16), (size_t)8);
BUG_ON(packet->skb->len - sizeof(*packet) < size);
memcpy(packet->header, data, 16);
memcpy(packet->data, data + 4, size);
break; break;
header_size = 16;
size = packet_size_to_data_size(min(size, (size_t)(16 + 8)),
header_size,
packet->allocated_data_size,
tcode);
goto dequeue;
} }
if (!tcode_match) { spin_unlock_irqrestore(&pending_packets_lock, flags);
spin_unlock_irqrestore(&host->pending_packet_queue.lock, flags); HPSB_DEBUG("unsolicited response packet received - %s",
HPSB_INFO("unsolicited response packet received - tcode mismatch"); "tcode mismatch");
dump_packet("contents", data, 16, -1); dump_packet("contents", data, 16, -1);
return; return;
}
__skb_unlink(skb, &host->pending_packet_queue); dequeue:
list_del_init(&packet->queue);
spin_unlock_irqrestore(&pending_packets_lock, flags);
if (packet->state == hpsb_queued) { if (packet->state == hpsb_queued) {
packet->sendtime = jiffies; packet->sendtime = jiffies;
packet->ack_code = ACK_PENDING; packet->ack_code = ACK_PENDING;
} }
packet->state = hpsb_complete; packet->state = hpsb_complete;
spin_unlock_irqrestore(&host->pending_packet_queue.lock, flags);
memcpy(packet->header, data, header_size);
if (size)
memcpy(packet->data, data + 4, size);
queue_packet_complete(packet); queue_packet_complete(packet);
} }
@ -783,6 +793,7 @@ static struct hpsb_packet *create_reply_packet(struct hpsb_host *host,
p = hpsb_alloc_packet(dsize); p = hpsb_alloc_packet(dsize);
if (unlikely(p == NULL)) { if (unlikely(p == NULL)) {
/* FIXME - send data_error response */ /* FIXME - send data_error response */
HPSB_ERR("out of memory, cannot send response packet");
return NULL; return NULL;
} }
@ -832,7 +843,6 @@ static void fill_async_readblock_resp(struct hpsb_packet *packet, int rcode,
static void fill_async_write_resp(struct hpsb_packet *packet, int rcode) static void fill_async_write_resp(struct hpsb_packet *packet, int rcode)
{ {
PREP_ASYNC_HEAD_RCODE(TCODE_WRITE_RESPONSE); PREP_ASYNC_HEAD_RCODE(TCODE_WRITE_RESPONSE);
packet->header[2] = 0;
packet->header_size = 12; packet->header_size = 12;
packet->data_size = 0; packet->data_size = 0;
} }
@ -1002,8 +1012,8 @@ void hpsb_packet_received(struct hpsb_host *host, quadlet_t *data, size_t size,
{ {
int tcode; int tcode;
if (host->in_bus_reset) { if (unlikely(host->in_bus_reset)) {
HPSB_INFO("received packet during reset; ignoring"); HPSB_DEBUG("received packet during reset; ignoring");
return; return;
} }
@ -1037,23 +1047,27 @@ void hpsb_packet_received(struct hpsb_host *host, quadlet_t *data, size_t size,
break; break;
default: default:
HPSB_NOTICE("received packet with bogus transaction code %d", HPSB_DEBUG("received packet with bogus transaction code %d",
tcode); tcode);
break; break;
} }
} }
static void abort_requests(struct hpsb_host *host) static void abort_requests(struct hpsb_host *host)
{ {
struct hpsb_packet *packet; struct hpsb_packet *packet, *p;
struct sk_buff *skb; struct list_head tmp;
unsigned long flags;
host->driver->devctl(host, CANCEL_REQUESTS, 0); host->driver->devctl(host, CANCEL_REQUESTS, 0);
while ((skb = skb_dequeue(&host->pending_packet_queue)) != NULL) { INIT_LIST_HEAD(&tmp);
packet = (struct hpsb_packet *)skb->data; spin_lock_irqsave(&pending_packets_lock, flags);
list_splice_init(&host->pending_packets, &tmp);
spin_unlock_irqrestore(&pending_packets_lock, flags);
list_for_each_entry_safe(packet, p, &tmp, queue) {
list_del_init(&packet->queue);
packet->state = hpsb_complete; packet->state = hpsb_complete;
packet->ack_code = ACKX_ABORTED; packet->ack_code = ACKX_ABORTED;
queue_packet_complete(packet); queue_packet_complete(packet);
@ -1063,87 +1077,90 @@ static void abort_requests(struct hpsb_host *host)
void abort_timedouts(unsigned long __opaque) void abort_timedouts(unsigned long __opaque)
{ {
struct hpsb_host *host = (struct hpsb_host *)__opaque; struct hpsb_host *host = (struct hpsb_host *)__opaque;
unsigned long flags; struct hpsb_packet *packet, *p;
struct hpsb_packet *packet; struct list_head tmp;
struct sk_buff *skb; unsigned long flags, expire, j;
unsigned long expire;
spin_lock_irqsave(&host->csr.lock, flags); spin_lock_irqsave(&host->csr.lock, flags);
expire = host->csr.expire; expire = host->csr.expire;
spin_unlock_irqrestore(&host->csr.lock, flags); spin_unlock_irqrestore(&host->csr.lock, flags);
/* Hold the lock around this, since we aren't dequeuing all j = jiffies;
* packets, just ones we need. */ INIT_LIST_HEAD(&tmp);
spin_lock_irqsave(&host->pending_packet_queue.lock, flags); spin_lock_irqsave(&pending_packets_lock, flags);
while (!skb_queue_empty(&host->pending_packet_queue)) { list_for_each_entry_safe(packet, p, &host->pending_packets, queue) {
skb = skb_peek(&host->pending_packet_queue); if (time_before(packet->sendtime + expire, j))
list_move_tail(&packet->queue, &tmp);
packet = (struct hpsb_packet *)skb->data; else
if (time_before(packet->sendtime + expire, jiffies)) {
__skb_unlink(skb, &host->pending_packet_queue);
packet->state = hpsb_complete;
packet->ack_code = ACKX_TIMEOUT;
queue_packet_complete(packet);
} else {
/* Since packets are added to the tail, the oldest /* Since packets are added to the tail, the oldest
* ones are first, always. When we get to one that * ones are first, always. When we get to one that
* isn't timed out, the rest aren't either. */ * isn't timed out, the rest aren't either. */
break; break;
} }
if (!list_empty(&host->pending_packets))
mod_timer(&host->timeout, j + host->timeout_interval);
spin_unlock_irqrestore(&pending_packets_lock, flags);
list_for_each_entry_safe(packet, p, &tmp, queue) {
list_del_init(&packet->queue);
packet->state = hpsb_complete;
packet->ack_code = ACKX_TIMEOUT;
queue_packet_complete(packet);
} }
if (!skb_queue_empty(&host->pending_packet_queue))
mod_timer(&host->timeout, jiffies + host->timeout_interval);
spin_unlock_irqrestore(&host->pending_packet_queue.lock, flags);
} }
/* Kernel thread and vars, which handles packets that are completed. Only
* packets that have a "complete" function are sent here. This way, the
* completion is run out of kernel context, and doesn't block the rest of
* the stack. */
static struct task_struct *khpsbpkt_thread; static struct task_struct *khpsbpkt_thread;
static struct sk_buff_head hpsbpkt_queue; static LIST_HEAD(hpsbpkt_queue);
static void queue_packet_complete(struct hpsb_packet *packet) static void queue_packet_complete(struct hpsb_packet *packet)
{ {
unsigned long flags;
if (packet->no_waiter) { if (packet->no_waiter) {
hpsb_free_packet(packet); hpsb_free_packet(packet);
return; return;
} }
if (packet->complete_routine != NULL) { if (packet->complete_routine != NULL) {
skb_queue_tail(&hpsbpkt_queue, packet->skb); spin_lock_irqsave(&pending_packets_lock, flags);
list_add_tail(&packet->queue, &hpsbpkt_queue);
spin_unlock_irqrestore(&pending_packets_lock, flags);
wake_up_process(khpsbpkt_thread); wake_up_process(khpsbpkt_thread);
} }
return; return;
} }
/*
* Kernel thread which handles packets that are completed. This way the
* packet's "complete" function is asynchronously run in process context.
* Only packets which have a "complete" function may be sent here.
*/
static int hpsbpkt_thread(void *__hi) static int hpsbpkt_thread(void *__hi)
{ {
struct sk_buff *skb; struct hpsb_packet *packet, *p;
struct hpsb_packet *packet; struct list_head tmp;
void (*complete_routine)(void*); int may_schedule;
void *complete_data;
current->flags |= PF_NOFREEZE; current->flags |= PF_NOFREEZE;
while (!kthread_should_stop()) { while (!kthread_should_stop()) {
while ((skb = skb_dequeue(&hpsbpkt_queue)) != NULL) {
packet = (struct hpsb_packet *)skb->data;
complete_routine = packet->complete_routine; INIT_LIST_HEAD(&tmp);
complete_data = packet->complete_data; spin_lock_irq(&pending_packets_lock);
list_splice_init(&hpsbpkt_queue, &tmp);
spin_unlock_irq(&pending_packets_lock);
packet->complete_routine = packet->complete_data = NULL; list_for_each_entry_safe(packet, p, &tmp, queue) {
list_del_init(&packet->queue);
complete_routine(complete_data); packet->complete_routine(packet->complete_data);
} }
set_current_state(TASK_INTERRUPTIBLE); set_current_state(TASK_INTERRUPTIBLE);
if (!skb_peek(&hpsbpkt_queue)) spin_lock_irq(&pending_packets_lock);
may_schedule = list_empty(&hpsbpkt_queue);
spin_unlock_irq(&pending_packets_lock);
if (may_schedule)
schedule(); schedule();
__set_current_state(TASK_RUNNING); __set_current_state(TASK_RUNNING);
} }
@ -1154,8 +1171,6 @@ static int __init ieee1394_init(void)
{ {
int i, ret; int i, ret;
skb_queue_head_init(&hpsbpkt_queue);
/* non-fatal error */ /* non-fatal error */
if (hpsb_init_config_roms()) { if (hpsb_init_config_roms()) {
HPSB_ERR("Failed to initialize some config rom entries.\n"); HPSB_ERR("Failed to initialize some config rom entries.\n");

27
drivers/ieee1394/ieee1394_core.h
View File

@ -4,7 +4,6 @@
#include <linux/device.h> #include <linux/device.h>
#include <linux/fs.h> #include <linux/fs.h>
#include <linux/list.h> #include <linux/list.h>
#include <linux/skbuff.h>
#include <linux/types.h> #include <linux/types.h>
#include <asm/atomic.h> #include <asm/atomic.h>
@ -13,7 +12,7 @@
struct hpsb_packet { struct hpsb_packet {
/* This struct is basically read-only for hosts with the exception of /* 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. /* 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 */ /* Speed to transmit with: 0 = 100Mbps, 1 = 200Mbps, 2 = 400Mbps */
unsigned speed_code:2; 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; struct hpsb_host *host;
unsigned int generation; unsigned int generation;
atomic_t refcnt; atomic_t refcnt;
struct list_head queue;
/* Function (and possible data to pass to it) to call when this /* Function (and possible data to pass to it) to call when this
* packet is completed. */ * packet is completed. */
void (*complete_routine)(void *); void (*complete_routine)(void *);
void *complete_data; void *complete_data;
/* XXX This is just a hack at the moment */
struct sk_buff *skb;
/* Store jiffies for implementing bus timeouts. */ /* Store jiffies for implementing bus timeouts. */
unsigned long sendtime; 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, void hpsb_set_packet_complete_task(struct hpsb_packet *packet,

3
drivers/ieee1394/raw1394.c
View File

@ -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 header_length = req->req.misc & 0xffff;
int expect_response = req->req.misc >> 16; 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.error = RAW1394_ERROR_INVALID_ARG;
req->req.length = 0; req->req.length = 0;
queue_complete_req(req); queue_complete_req(req);