From 8fede89f853a7bfc671f9d8f069ccfe4190061f3 Mon Sep 17 00:00:00 2001
From: Mark Brown <broonie@kernel.org>
Date: Fri, 22 May 2020 16:50:05 +0100
Subject: [PATCH] spi: Make spi_delay_exec() warn if called from atomic context
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>
---
drivers/spi/spi.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index d32bdc6cbf66..c765c966cc8e 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;