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path: root/drivers/firewire/ohci.c
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Diffstat (limited to 'drivers/firewire/ohci.c')
-rw-r--r--drivers/firewire/ohci.c25
1 files changed, 17 insertions, 8 deletions
diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c
index dfb3cb774a79..435ed800d03f 100644
--- a/drivers/firewire/ohci.c
+++ b/drivers/firewire/ohci.c
@@ -1218,6 +1218,7 @@ static void context_stop(struct context *ctx)
}
struct driver_data {
+ u8 inline_data[8];
struct fw_packet *packet;
};
@@ -1301,20 +1302,28 @@ static int at_context_queue_packet(struct context *ctx,
return -1;
}
+ BUILD_BUG_ON(sizeof(struct driver_data) > sizeof(struct descriptor));
driver_data = (struct driver_data *) &d[3];
driver_data->packet = packet;
packet->driver_data = driver_data;
if (packet->payload_length > 0) {
- payload_bus =
- dma_map_single(ohci->card.device, packet->payload,
- packet->payload_length, DMA_TO_DEVICE);
- if (dma_mapping_error(ohci->card.device, payload_bus)) {
- packet->ack = RCODE_SEND_ERROR;
- return -1;
+ if (packet->payload_length > sizeof(driver_data->inline_data)) {
+ payload_bus = dma_map_single(ohci->card.device,
+ packet->payload,
+ packet->payload_length,
+ DMA_TO_DEVICE);
+ if (dma_mapping_error(ohci->card.device, payload_bus)) {
+ packet->ack = RCODE_SEND_ERROR;
+ return -1;
+ }
+ packet->payload_bus = payload_bus;
+ packet->payload_mapped = true;
+ } else {
+ memcpy(driver_data->inline_data, packet->payload,
+ packet->payload_length);
+ payload_bus = d_bus + 3 * sizeof(*d);
}
- packet->payload_bus = payload_bus;
- packet->payload_mapped = true;
d[2].req_count = cpu_to_le16(packet->payload_length);
d[2].data_address = cpu_to_le32(payload_bus);