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spi: Make spi_delay_exec() warn if called from atomic context

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If the delay used is long enough the spi_delay_exec() will use a sleeping
function to implement it. Add a might_sleep() here to help avoid callers
using this from an atomic context and running into problems at runtime on
other systems.

Suggested-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Signed-off-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20200522155005.46099-1-broonie@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Mark Brown 2020-05-22 16:50:05 +01:00
parent 36f8f189b8
commit 8fede89f85
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1 changed files with 2 additions and 0 deletions
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drivers/spi/spi.c
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@ -1160,6 +1160,8 @@ int spi_delay_exec(struct spi_delay *_delay, struct spi_transfer *xfer)
{ {
int delay; int delay;
might_sleep();
if (!_delay) if (!_delay)
return -EINVAL; return -EINVAL;