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

[Mark Brown <broonie@xxxxxxxxxx>]

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@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
---
 drivers/spi/spi.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index e02f434affca..c69d23379e08 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1160,6 +1160,8 @@ int spi_delay_exec(struct spi_delay *_delay, struct spi_transfer *xfer)
 {
 	int delay;
 
+	might_sleep();
+
 	if (!_delay)
 		return -EINVAL;
 
-- 
2.20.1