diff options
Diffstat (limited to 'drivers/firewire/core-transaction.c')
| -rw-r--r-- | drivers/firewire/core-transaction.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/firewire/core-transaction.c b/drivers/firewire/core-transaction.c index d00f8ce902c..77275fdf6c1 100644 --- a/drivers/firewire/core-transaction.c +++ b/drivers/firewire/core-transaction.c @@ -326,8 +326,8 @@ static int allocate_tlabel(struct fw_card *card) * It will contain tag, channel, and sy data instead of a node ID then. * * The payload buffer at @data is going to be DMA-mapped except in case of - * quadlet-sized payload or of local (loopback) requests. Hence make sure that - * the buffer complies with the restrictions for DMA-mapped memory. The + * @length <= 8 or of local (loopback) requests. Hence make sure that the + * buffer complies with the restrictions of the streaming DMA mapping API. * @payload must not be freed before the @callback is called. * * In case of request types without payload, @data is NULL and @length is 0. @@ -411,7 +411,8 @@ static void transaction_callback(struct fw_card *card, int rcode, * * Returns the RCODE. See fw_send_request() for parameter documentation. * Unlike fw_send_request(), @data points to the payload of the request or/and - * to the payload of the response. + * to the payload of the response. DMA mapping restrictions apply to outbound + * request payloads of >= 8 bytes but not to inbound response payloads. */ int fw_run_transaction(struct fw_card *card, int tcode, int destination_id, int generation, int speed, unsigned long long offset, |