From 6820e812dafb4258bc14692f686eec5bde6fba86 Mon Sep 17 00:00:00 2001 From: Tudor Ambarus Date: Wed, 16 Dec 2020 11:23:21 +0200 Subject: [PATCH] spi: Fix the clamping of spi->max_speed_hz If spi->controller->max_speed_hz is zero, a non-zero spi->max_speed_hz will be overwritten by zero. Make sure spi->controller->max_speed_hz is not zero when clamping spi->max_speed_hz. Put the spi->controller->max_speed_hz non-zero check higher in the if, so that we avoid a superfluous init to zero when both spi->max_speed_hz and spi->controller->max_speed_hz are zero. Fixes: 9326e4f1e5dd ("spi: Limit the spi device max speed to controller's max speed") Reported-by: Geert Uytterhoeven Suggested-by: Geert Uytterhoeven Signed-off-by: Tudor Ambarus Tested-by: Geert Uytterhoeven Link: https://lore.kernel.org/r/20201216092321.413262-1-tudor.ambarus@microchip.com Signed-off-by: Mark Brown --- drivers/spi/spi.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 51d7c004fbab..f59bf5094adb 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -3378,8 +3378,9 @@ int spi_setup(struct spi_device *spi) if (status) return status; - if (!spi->max_speed_hz || - spi->max_speed_hz > spi->controller->max_speed_hz) + if (spi->controller->max_speed_hz && + (!spi->max_speed_hz || + spi->max_speed_hz > spi->controller->max_speed_hz)) spi->max_speed_hz = spi->controller->max_speed_hz; mutex_lock(&spi->controller->io_mutex);