spi: Reduce kthread priority

The SPI thingies request FIFO-99 by default, reduce this to FIFO-50.

FIFO-99 is the very highest priority available to SCHED_FIFO and
it not a suitable default; it would indicate the SPI work is the
most important work on the machine.

Cc: Benson Leung <bleung@chromium.org>
Cc: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Cc: Guenter Roeck <groeck@chromium.org>
Cc: Mark Brown <broonie@kernel.org>
Cc: linux-spi@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20190801111541.917256884@infradead.org
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/platform/chrome/cros_ec_spi.c b/drivers/platform/chrome/cros_ec_spi.c
index 006a8ff640573fa56e42a9c421cfd8f6664f5cd4..714306bc3f79f32f3d82628ccaa2311ce3623ab3 100644 (file)
--- a/drivers/platform/chrome/cros_ec_spi.c
+++ b/drivers/platform/chrome/cros_ec_spi.c
@@ -706,7 +706,7 @@ static int cros_ec_spi_devm_high_pri_alloc(struct device *dev,
                                           struct cros_ec_spi *ec_spi)
 {
        struct sched_param sched_priority = {
-               .sched_priority = MAX_RT_PRIO - 1,
+               .sched_priority = MAX_RT_PRIO / 2,
        };
        int err;
 

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 9fd7926e80c076818214814e10047c1ab466b3d6..8e83c9567353345262a8715b27284d44ed8b871d 100644 (file)
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1434,7 +1434,7 @@ static void spi_pump_messages(struct kthread_work *work)
  */
 static void spi_set_thread_rt(struct spi_controller *ctlr)
 {
-       struct sched_param param = { .sched_priority = MAX_RT_PRIO - 1 };
+       struct sched_param param = { .sched_priority = MAX_RT_PRIO / 2 };
 
        dev_info(&ctlr->dev,
                "will run message pump with realtime priority\n");