diff options
| author | Tudor Ambarus <tudor.ambarus@microchip.com> | 2020-12-16 12:23:21 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2020-12-30 16:45:23 +0300 |
| commit | 6820e812dafb4258bc14692f686eec5bde6fba86 (patch) | |
| tree | 8c3bc29d125a88570e3cc3b0534e11f6aaee5703 /drivers/spi/spi.c | |
| parent | ede090f5a438e97d0586f64067bbb956e30a2a31 (diff) | |
| download | linux-6820e812dafb4258bc14692f686eec5bde6fba86.tar.xz | |
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 <geert@linux-m68k.org>
Suggested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20201216092321.413262-1-tudor.ambarus@microchip.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi.c')
| -rw-r--r-- | drivers/spi/spi.c | 5 |
1 files 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); |