firewire: Implement proper transaction cancelation.

Drivers such as fw-sbp2 had no way to properly cancel in-progress
transactions, which could leave a pending transaction or an unset
packet in the low-level queues after kfree'ing the containing
structure. fw_cancel_transaction() lets drivers cancel a submitted
transaction.

Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Kristian Høgsberg 2007-02-06 14:49:32 -05:00 committed by Stefan Richter
parent 72e318e07e
commit 730c32f58b
5 changed files with 95 additions and 7 deletions

View File

@ -474,6 +474,12 @@ dummy_send_response(struct fw_card *card, struct fw_packet *packet)
packet->callback(packet, card, -ENODEV);
}
static int
dummy_cancel_packet(struct fw_card *card, struct fw_packet *packet)
{
return -ENOENT;
}
static int
dummy_enable_phys_dma(struct fw_card *card,
int node_id, int generation)
@ -487,6 +493,7 @@ static struct fw_card_driver dummy_driver = {
.update_phy_reg = dummy_update_phy_reg,
.set_config_rom = dummy_set_config_rom,
.send_request = dummy_send_request,
.cancel_packet = dummy_cancel_packet,
.send_response = dummy_send_response,
.enable_phys_dma = dummy_enable_phys_dma,
};

View File

@ -79,6 +79,7 @@ struct at_context {
struct fw_ohci *ohci;
dma_addr_t descriptor_bus;
dma_addr_t buffer_bus;
struct fw_packet *current_packet;
struct list_head list;
@ -489,6 +490,7 @@ at_context_setup_packet(struct at_context *ctx, struct list_head *list)
ctx->descriptor_bus | z);
reg_write(ctx->ohci, control_set(ctx->regs),
CONTEXT_RUN | CONTEXT_WAKE);
ctx->current_packet = packet;
} else {
/* We dont return error codes from this function; all
* transmission errors are reported through the
@ -524,6 +526,12 @@ static void at_context_tasklet(unsigned long data)
at_context_stop(ctx);
/* If the head of the list isn't the packet that just got
* transmitted, the packet got cancelled before we finished
* transmitting it. */
if (ctx->current_packet != packet)
goto skip_to_next;
if (packet->payload_length > 0) {
dma_unmap_single(ohci->card.device, packet->payload_bus,
packet->payload_length, DMA_TO_DEVICE);
@ -564,6 +572,7 @@ static void at_context_tasklet(unsigned long data)
} else
complete_transmission(packet, evt - 16, &list);
skip_to_next:
/* If more packets are queued, set up the next one. */
if (!list_empty(&ctx->list))
at_context_setup_packet(ctx, &list);
@ -1012,6 +1021,29 @@ static void ohci_send_response(struct fw_card *card, struct fw_packet *packet)
at_context_transmit(&ohci->at_response_ctx, packet);
}
static int ohci_cancel_packet(struct fw_card *card, struct fw_packet *packet)
{
struct fw_ohci *ohci = fw_ohci(card);
LIST_HEAD(list);
unsigned long flags;
spin_lock_irqsave(&ohci->lock, flags);
if (packet->ack == 0) {
fw_notify("cancelling packet %p (header[0]=%08x)\n",
packet, packet->header[0]);
complete_transmission(packet, RCODE_CANCELLED, &list);
}
spin_unlock_irqrestore(&ohci->lock, flags);
do_packet_callbacks(ohci, &list);
/* Return success if we actually cancelled something. */
return list_empty(&list) ? -ENOENT : 0;
}
static int
ohci_enable_phys_dma(struct fw_card *card, int node_id, int generation)
{
@ -1339,6 +1371,7 @@ static const struct fw_card_driver ohci_driver = {
.set_config_rom = ohci_set_config_rom,
.send_request = ohci_send_request,
.send_response = ohci_send_response,
.cancel_packet = ohci_cancel_packet,
.enable_phys_dma = ohci_enable_phys_dma,
.allocate_iso_context = ohci_allocate_iso_context,

View File

@ -348,6 +348,9 @@ static void sbp2_cancel_orbs(struct fw_unit *unit)
spin_unlock_irqrestore(&device->card->lock, flags);
list_for_each_entry_safe(orb, next, &list, link) {
if (fw_cancel_transaction(device->card, &orb->t) == 0)
continue;
orb->rcode = RCODE_CANCELLED;
orb->callback(orb, NULL);
}

View File

@ -59,20 +59,52 @@
#define phy_config_root_id(node_id) ((((node_id) & 0x3f) << 24) | (1 << 23))
#define phy_identifier(id) ((id) << 30)
static void
close_transaction(struct fw_transaction *t, struct fw_card *card, int rcode,
u32 * payload, size_t length)
static int
close_transaction(struct fw_transaction *transaction,
struct fw_card *card, int rcode,
u32 *payload, size_t length)
{
struct fw_transaction *t;
unsigned long flags;
spin_lock_irqsave(&card->lock, flags);
card->tlabel_mask &= ~(1 << t->tlabel);
list_del(&t->link);
list_for_each_entry(t, &card->transaction_list, link) {
if (t == transaction) {
list_del(&t->link);
card->tlabel_mask &= ~(1 << t->tlabel);
break;
}
}
spin_unlock_irqrestore(&card->lock, flags);
t->callback(card, rcode, payload, length, t->callback_data);
if (&t->link != &card->transaction_list) {
t->callback(card, rcode, payload, length, t->callback_data);
return 0;
}
return -ENOENT;
}
/* Only valid for transactions that are potentially pending (ie have
* been sent). */
int
fw_cancel_transaction(struct fw_card *card,
struct fw_transaction *transaction)
{
/* Cancel the packet transmission if it's still queued. That
* will call the packet transmission callback which cancels
* the transaction. */
if (card->driver->cancel_packet(card, &transaction->packet) == 0)
return 0;
/* If the request packet has already been sent, we need to see
* if the transaction is still pending and remove it in that case. */
return close_transaction(transaction, card, RCODE_CANCELLED, NULL, 0);
}
EXPORT_SYMBOL(fw_cancel_transaction);
static void
transmit_complete_callback(struct fw_packet *packet,
struct fw_card *card, int status)
@ -162,6 +194,7 @@ fw_fill_request(struct fw_packet *packet, int tcode, int tlabel,
packet->speed = speed;
packet->generation = generation;
packet->ack = 0;
}
/**
@ -298,8 +331,14 @@ void fw_flush_transactions(struct fw_card *card)
card->tlabel_mask = 0;
spin_unlock_irqrestore(&card->lock, flags);
list_for_each_entry_safe(t, next, &list, link)
list_for_each_entry_safe(t, next, &list, link) {
card->driver->cancel_packet(card, &t->packet);
/* At this point cancel_packet will never call the
* transaction callback, since we just took all the
* transactions out of the list. So do it here.*/
t->callback(card, RCODE_CANCELLED, NULL, 0, t->callback_data);
}
}
static struct fw_address_handler *
@ -531,6 +570,7 @@ allocate_request(struct fw_packet *p)
request->response.speed = p->speed;
request->response.timestamp = t;
request->response.generation = p->generation;
request->response.ack = 0;
request->response.callback = free_response_callback;
request->ack = p->ack;
request->length = length;

View File

@ -391,6 +391,8 @@ struct fw_card_driver {
void (*send_request) (struct fw_card *card, struct fw_packet *packet);
void (*send_response) (struct fw_card *card, struct fw_packet *packet);
/* Calling cancel is valid once a packet has been submitted. */
int (*cancel_packet) (struct fw_card *card, struct fw_packet *packet);
/* Allow the specified node ID to do direct DMA out and in of
* host memory. The card will disable this for all node when
@ -421,6 +423,9 @@ fw_send_request(struct fw_card *card, struct fw_transaction *t,
void *data, size_t length,
fw_transaction_callback_t callback, void *callback_data);
int fw_cancel_transaction(struct fw_card *card,
struct fw_transaction *transaction);
void fw_flush_transactions(struct fw_card *card);
void fw_send_phy_config(struct fw_card *card,