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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. rcn-ee: add use_adma option: https://www.spinics.net/lists/linux-omap/msg137942.html Signed-off-by: Will Newton <email@example.com> Signed-off-by: Robert Nelson <firstname.lastname@example.org>
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