spi: Remove SPI_BUFSIZ restriction on spi_write_then_read()

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In order to avoid constantly allocating and deallocating there is a fixed
buffer which spi_write_then_read() uses for transfers, with an early error
check to ensure that the transfer fits within the buffer. This limits the
size of transfers to this size, currently max(32, SMP_CACHE_BYTES).

Since we can dynamically allocate and in fact already have a fallback
to do so when there is contention for the fixed buffer remove this
restriction and instead dynamically allocate a suitably sized buffer if
the transfer won't fit.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

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Mark Brown 2012-12-02 12:54:25 +09:00 • committed by Grant Likely

parent 266904c779

commit b3a223ee2d

1 changed files with 11 additions and 13 deletions

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drivers/spi/spi.c

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