[PATCH v2 07/14] spi: fsi: Open-code message transfer walk

[Kaitao Cheng]

From: Kaitao Cheng <chengkaitao@xxxxxxxxxx>

A later change will make list_for_each_entry() cache the next element
before entering the loop body. fsi_spi_transfer_one_message() can combine
the current transfer with the following transfer and then advance the
cursor to that consumed entry.

Keep the transfer walk open-coded so the loop step observes that cursor
update and skips the consumed transfer. This preserves the existing
message sequencing semantics and prepares the code for the list iterator
update.

Signed-off-by: Kaitao Cheng <chengkaitao@xxxxxxxxxx>
---
 drivers/spi/spi-fsi.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-fsi.c b/drivers/spi/spi-fsi.c
index f6a75f0184c4..44999f00f5f6 100644
--- a/drivers/spi/spi-fsi.c
+++ b/drivers/spi/spi-fsi.c
@@ -434,7 +434,10 @@ static int fsi_spi_transfer_one_message(struct spi_controller *ctlr,
 	if (rc)
 		goto error;
 
-	list_for_each_entry(transfer, &mesg->transfers, transfer_list) {
+	for (transfer = list_first_entry(&mesg->transfers,
+					 typeof(*transfer), transfer_list);
+	     !list_entry_is_head(transfer, &mesg->transfers, transfer_list);
+	     transfer = list_next_entry(transfer, transfer_list)) {
 		struct fsi_spi_sequence seq;
 		struct spi_transfer *next = NULL;
 
-- 
2.43.0