spi: fsl-espi: pre-allocate message buffer

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Currently the driver allocates a 64kb buffer for each single message.
On systems with little and fragmented memory this can result in
memory allocation errors. Solve this by pre-allocating a buffer.

This patch was developed in OpenWRT long ago, however it never
made it upstream.

I slightly modified the original patch to re-initialize the buffer
at the beginning of each transfer.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

...

This commit is contained in:

Heiner Kallweit 2016-09-07 22:50:22 +02:00 • committed by Mark Brown

parent 71581a1507

commit 1423877b73

2 changed files with 19 additions and 23 deletions

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41

drivers/spi/spi-fsl-espi.c

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1

drivers/spi/spi-fsl-lib.h

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