From cd1b9dd0220d3c126b3b61c1f96f0832fc21fc61 Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Thu, 10 Oct 2013 22:25:23 +0100 Subject: [PATCH] regmap: spi: Handle async writes of only one buffer If the value is zero then assume it has been included in the register data and don't send anything, minimising the number of interactions with the hardware. Signed-off-by: Mark Brown --- drivers/base/regmap/regmap-spi.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/base/regmap/regmap-spi.c b/drivers/base/regmap/regmap-spi.c index 4c506bd940f3..37f12ae7aada 100644 --- a/drivers/base/regmap/regmap-spi.c +++ b/drivers/base/regmap/regmap-spi.c @@ -73,7 +73,8 @@ static int regmap_spi_async_write(void *context, spi_message_init(&async->m); spi_message_add_tail(&async->t[0], &async->m); - spi_message_add_tail(&async->t[1], &async->m); + if (val) + spi_message_add_tail(&async->t[1], &async->m); async->m.complete = regmap_spi_complete; async->m.context = async; -- 2.39.5