spi: use spi_valid_{tx,rx}buf() in stats function

There are macros spi_valid_txbuf() and spi_valid_rxbuf() for determining
if an xfer actually intended to send or receive data.

These checks were hard-coded in spi_statistics_add_transfer_stats(). We
can make use of the macros instead to make the code more readable and
more robust against potential future changes in case the definition of
what valid means changes.

The macro takes the spi_message as an argument, so we need to change
spi_statistics_add_transfer_stats() to take the spi_message as an
argument instead of the controller.
Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://lore.kernel.org/r/20240430201530.2138095-3-dlechner@baylibre.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi.c

@@ -312,7 +312,7 @@ static const struct attribute_group *spi_master_groups[] = {
 
 static void spi_statistics_add_transfer_stats(struct spi_statistics __percpu *pcpu_stats,
 					      struct spi_transfer *xfer,
-					      struct spi_controller *ctlr)
+					      struct spi_message *msg)
 {
 	int l2len = min(fls(xfer->len), SPI_STATISTICS_HISTO_SIZE) - 1;
 	struct spi_statistics *stats;
@@ -328,11 +328,9 @@ static void spi_statistics_add_transfer_stats(struct spi_statistics __percpu *pc
 	u64_stats_inc(&stats->transfer_bytes_histo[l2len]);
 
 	u64_stats_add(&stats->bytes, xfer->len);
-	if ((xfer->tx_buf) &&
-	    (xfer->tx_buf != ctlr->dummy_tx))
+	if (spi_valid_txbuf(msg, xfer))
 		u64_stats_add(&stats->bytes_tx, xfer->len);
-	if ((xfer->rx_buf) &&
-	    (xfer->rx_buf != ctlr->dummy_rx))
+	if (spi_valid_rxbuf(msg, xfer))
 		u64_stats_add(&stats->bytes_rx, xfer->len);
 
 	u64_stats_update_end(&stats->syncp);
@@ -1618,8 +1616,8 @@ static int spi_transfer_one_message(struct spi_controller *ctlr,
 	list_for_each_entry(xfer, &msg->transfers, transfer_list) {
 		trace_spi_transfer_start(msg, xfer);
 
-		spi_statistics_add_transfer_stats(statm, xfer, ctlr);
-		spi_statistics_add_transfer_stats(stats, xfer, ctlr);
+		spi_statistics_add_transfer_stats(statm, xfer, msg);
+		spi_statistics_add_transfer_stats(stats, xfer, msg);
 
 		if (!ctlr->ptp_sts_supported) {
 			xfer->ptp_sts_word_pre = 0;