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firewire: fw-ohci: fix IOMMU resource exhaustion

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There is a DMA map/ unmap imbalance whenever a block write request
packet is sent and then dequeued with ohci_cancel_packet.  The latter
may happen frequently if the AR resp tasklet is executed before the AT
req tasklet for the same transaction.

Add the missing dma_unmap_single.  This fixes
https://bugzilla.redhat.com/show_bug.cgi?id=475156

Reported-by: Emmanuel Kowalski
Tested-by: Emmanuel Kowalski
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Stefan Richter 2008-12-10 00:20:38 +01:00
parent ec9a13cdbf
commit 1d1dc5e83f
3 changed files with 12 additions and 4 deletions
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11
drivers/firewire/fw-ohci.c
View file

@ -974,6 +974,7 @@ at_context_queue_packet(struct context *ctx, struct fw_packet *packet)
packet->ack = RCODE_SEND_ERROR;
return -1;
}
packet->payload_bus = payload_bus;
d[2].req_count = cpu_to_le16(packet->payload_length);
d[2].data_address = cpu_to_le32(payload_bus);
@ -1025,7 +1026,6 @@ static int handle_at_packet(struct context *context,
struct driver_data *driver_data;
struct fw_packet *packet;
struct fw_ohci *ohci = context->ohci;
dma_addr_t payload_bus;
int evt;
if (last->transfer_status == 0)
@ -1038,9 +1038,8 @@ static int handle_at_packet(struct context *context,
/* This packet was cancelled, just continue. */
return 1;
payload_bus = le32_to_cpu(last->data_address);
if (payload_bus != 0)
dma_unmap_single(ohci->card.device, payload_bus,
if (packet->payload_bus)
dma_unmap_single(ohci->card.device, packet->payload_bus,
packet->payload_length, DMA_TO_DEVICE);
evt = le16_to_cpu(last->transfer_status) & 0x1f;
@ -1697,6 +1696,10 @@ static int ohci_cancel_packet(struct fw_card *card, struct fw_packet *packet)
if (packet->ack != 0)
goto out;
if (packet->payload_bus)
dma_unmap_single(ohci->card.device, packet->payload_bus,
packet->payload_length, DMA_TO_DEVICE);
log_ar_at_event('T', packet->speed, packet->header, 0x20);
driver_data->packet = NULL;
packet->ack = RCODE_CANCELLED;

3
drivers/firewire/fw-transaction.c
View file

@ -207,6 +207,7 @@ fw_fill_request(struct fw_packet *packet, int tcode, int tlabel,
packet->speed = speed;
packet->generation = generation;
packet->ack = 0;
packet->payload_bus = 0;
}
/**
@ -581,6 +582,8 @@ fw_fill_response(struct fw_packet *response, u32 *request_header,
BUG();
return;
}
response->payload_bus = 0;
}
EXPORT_SYMBOL(fw_fill_response);

2
drivers/firewire/fw-transaction.h
View file

@ -27,6 +27,7 @@
#include <linux/list.h>
#include <linux/spinlock_types.h>
#include <linux/timer.h>
#include <linux/types.h>
#include <linux/workqueue.h>
#define TCODE_IS_READ_REQUEST(tcode) (((tcode) & ~1) == 4)
@ -153,6 +154,7 @@ struct fw_packet {
size_t header_length;
void *payload;
size_t payload_length;
dma_addr_t payload_bus;
u32 timestamp;
/*