1 files changed, 27 insertions, 14 deletions

diff --git a/drivers/firewire/core-transaction.c b/drivers/firewire/core-transaction.c
index a20f97fdd06c..130b95aca629 100644
--- a/drivers/firewire/core-transaction.c
+++ b/drivers/firewire/core-transaction.c
@@ -316,7 +316,8 @@ static int allocate_tlabel(struct fw_card *card)
 }
 
 /**
- * fw_send_request() - submit a request packet for transmission
+ * __fw_send_request() - submit a request packet for transmission to generate callback for response
+ *			 subaction with or without time stamp.
  * @card:		interface to send the request at
  * @t:			transaction instance to which the request belongs
  * @tcode:		transaction code
@@ -326,7 +327,9 @@ static int allocate_tlabel(struct fw_card *card)
  * @offset:		48bit wide offset into destination's address space
  * @payload:		data payload for the request subaction
  * @length:		length of the payload, in bytes
- * @callback:		function to be called when the transaction is completed
+ * @callback:		union of two functions whether to receive time stamp or not for response
+ *			subaction.
+ * @with_tstamp:	Whether to receive time stamp or not for response subaction.
  * @callback_data:	data to be passed to the transaction completion callback
  *
  * Submit a request packet into the asynchronous request transmission queue.
@@ -363,10 +366,10 @@ static int allocate_tlabel(struct fw_card *card)
  * transaction completion and hence execution of @callback may happen even
  * before fw_send_request() returns.
  */
-void fw_send_request(struct fw_card *card, struct fw_transaction *t, int tcode,
-		     int destination_id, int generation, int speed,
-		     unsigned long long offset, void *payload, size_t length,
-		     fw_transaction_callback_t callback, void *callback_data)
+void __fw_send_request(struct fw_card *card, struct fw_transaction *t, int tcode,
+		int destination_id, int generation, int speed, unsigned long long offset,
+		void *payload, size_t length, union fw_transaction_callback callback,
+		bool with_tstamp, void *callback_data)
 {
 	unsigned long flags;
 	int tlabel;
@@ -381,7 +384,19 @@ void fw_send_request(struct fw_card *card, struct fw_transaction *t, int tcode,
 	tlabel = allocate_tlabel(card);
 	if (tlabel < 0) {
 		spin_unlock_irqrestore(&card->lock, flags);
-		callback(card, RCODE_SEND_ERROR, NULL, 0, callback_data);
+		if (!with_tstamp) {
+			callback.without_tstamp(card, RCODE_SEND_ERROR, NULL, 0, callback_data);
+		} else {
+			// Timestamping on behalf of hardware.
+			u32 curr_cycle_time = 0;
+			u32 tstamp;
+
+			(void)fw_card_read_cycle_time(card, &curr_cycle_time);
+			tstamp = cycle_time_to_ohci_tstamp(curr_cycle_time);
+
+			callback.with_tstamp(card, RCODE_SEND_ERROR, tstamp, tstamp, NULL, 0,
+					     callback_data);
+		}
 		return;
 	}
 
@@ -389,14 +404,12 @@ void fw_send_request(struct fw_card *card, struct fw_transaction *t, int tcode,
 	t->tlabel = tlabel;
 	t->card = card;
 	t->is_split_transaction = false;
-	timer_setup(&t->split_timeout_timer,
-		    split_transaction_timeout_callback, 0);
-	t->callback.without_tstamp = callback;
-	t->with_tstamp = false;
+	timer_setup(&t->split_timeout_timer, split_transaction_timeout_callback, 0);
+	t->callback = callback;
+	t->with_tstamp = with_tstamp;
 	t->callback_data = callback_data;
 
-	fw_fill_request(&t->packet, tcode, t->tlabel,
-			destination_id, card->node_id, generation,
+	fw_fill_request(&t->packet, tcode, t->tlabel, destination_id, card->node_id, generation,
 			speed, offset, payload, length);
 	t->packet.callback = transmit_complete_callback;
 
@@ -406,7 +419,7 @@ void fw_send_request(struct fw_card *card, struct fw_transaction *t, int tcode,
 
 	card->driver->send_request(card, &t->packet);
 }
-EXPORT_SYMBOL(fw_send_request);
+EXPORT_SYMBOL_GPL(__fw_send_request);
 
 struct transaction_callback_data {
 	struct completion done;