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spi: Fall back to master maximum speed if no slave speed specified 

If a slave appears with no maximum transfer speed specified fall back to
using the maximum for the master instead.  It's questionable if we
should let slaves do this but let's be defensive.

Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Mark Brown 2015-08-20 11:52:18 -07:00
parent bc0195aad0
commit 7dc9fbc342
1 changed files with 2 additions and 0 deletions
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2
drivers/spi/spi.c
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@ -1860,6 +1860,8 @@ static int __spi_validate(struct spi_device *spi, struct spi_message *message)
if (!xfer->speed_hz)
xfer->speed_hz = spi->max_speed_hz;
if (!xfer->speed_hz)
xfer->speed_hz = master->max_speed_hz;
if (master->max_speed_hz &&
xfer->speed_hz > master->max_speed_hz)