diff options
Diffstat (limited to 'drivers/firewire/core-transaction.c')
| -rw-r--r-- | drivers/firewire/core-transaction.c | 38 |
1 files changed, 37 insertions, 1 deletions
diff --git a/drivers/firewire/core-transaction.c b/drivers/firewire/core-transaction.c index fdc33ff06dc1..4fd5c3b2128e 100644 --- a/drivers/firewire/core-transaction.c +++ b/drivers/firewire/core-transaction.c @@ -580,6 +580,41 @@ static void free_response_callback(struct fw_packet *packet, kfree(request); } +int fw_get_response_length(struct fw_request *r) +{ + int tcode, ext_tcode, data_length; + + tcode = HEADER_GET_TCODE(r->request_header[0]); + + switch (tcode) { + case TCODE_WRITE_QUADLET_REQUEST: + case TCODE_WRITE_BLOCK_REQUEST: + return 0; + + case TCODE_READ_QUADLET_REQUEST: + return 4; + + case TCODE_READ_BLOCK_REQUEST: + data_length = HEADER_GET_DATA_LENGTH(r->request_header[3]); + return data_length; + + case TCODE_LOCK_REQUEST: + ext_tcode = HEADER_GET_EXTENDED_TCODE(r->request_header[3]); + data_length = HEADER_GET_DATA_LENGTH(r->request_header[3]); + switch (ext_tcode) { + case EXTCODE_FETCH_ADD: + case EXTCODE_LITTLE_ADD: + return data_length; + default: + return data_length / 2; + } + + default: + WARN(1, KERN_ERR "wrong tcode %d", tcode); + return 0; + } +} + void fw_fill_response(struct fw_packet *response, u32 *request_header, int rcode, void *payload, size_t length) { @@ -713,7 +748,8 @@ void fw_send_response(struct fw_card *card, if (rcode == RCODE_COMPLETE) fw_fill_response(&request->response, request->request_header, - rcode, request->data, request->length); + rcode, request->data, + fw_get_response_length(request)); else fw_fill_response(&request->response, request->request_header, rcode, NULL, 0); |