linux/drivers/mmc
Will Newton 9442400486 mmc: omap_hsmmc: Reduce max_segs for reliability
Reduce max_segs to 64, a value that allows allocation of an entire
EDMA descriptor list within a single page - EDMA descriptors
are 40 bytes and the header is much larger. This avoids doing a
higher order GFP_ATOMIC allocation in edma_prep_slave_sg
when setting up a transfer which can potentially fail due to
fragmentation under heavy I/O load.

The current value of 1024 is unusually high in comparison to
other mmc host drivers which mostly use values of between 1
and 256. The EDMA driver at present splits lists above 20
segments in any case so reducing the size of lists we pass to
it shouldn't add much overhead.

Signed-off-by: Will Newton <willn@resin.io>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-08-30 14:01:22 +02:00
..
core mmc: block: prevent propagating R1_OUT_OF_RANGE for open-ending mode 2017-08-21 13:32:31 +02:00
host mmc: omap_hsmmc: Reduce max_segs for reliability 2017-08-30 14:01:22 +02:00
Kconfig mmc: block: Move files to core 2016-12-12 16:30:05 +01:00
Makefile mmc: block: Move files to core 2016-12-12 16:30:05 +01:00