From 49ddedf3bfcb59a562c7db0e50aecd1422e9cdc9 Mon Sep 17 00:00:00 2001
From: Martin Sperl <kernel@martin.sperl.org>
Date: Fri, 27 Nov 2015 13:56:03 +0000
Subject: [PATCH] spi: add spi_message_init_no_memset to avoid zeroing the
spi_message
In the spi_loopback_test driver there is the need to initialize
a spi_message that is filled with values from a static structure.
Applying spi_message_init to such a prefilled structure results in
all the settings getting reset to zero, which is not what we want.
Copying each field of spi_message separately instead always includes
the risk that some new fields have not been implemented in the copying
code.
So here we introduce a version of spi_message_init called
spi_message_init_no_memset that does not fill the structure
with zero first, but only initializes the relevant list_heads.
Signed-off-by: Martin Sperl <kernel@martin.sperl.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
include/linux/spi/spi.h | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index cce80e6dc7d11..4c54d4744107d 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -762,10 +762,15 @@ struct spi_message {
void *state;
};
+static inline void spi_message_init_no_memset(struct spi_message *m)
+{
+ INIT_LIST_HEAD(&m->transfers);
+}
+
static inline void spi_message_init(struct spi_message *m)
{
memset(m, 0, sizeof *m);
- INIT_LIST_HEAD(&m->transfers);
+ spi_message_init_no_memset(m);
}
static inline void
--
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