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spi: add spi_message_init_no_memset to avoid zeroing the spi_message

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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>
This commit is contained in:
Martin Sperl 2015-11-27 13:56:03 +00:00 committed by Mark Brown
parent 8005c49d9a
commit 49ddedf3bf
1 changed files with 6 additions and 1 deletions
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7
include/linux/spi/spi.h
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@ -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