mmc: sdhci: avoid walking SG list for writes

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If we are writing data to the card, there is no point in walking the
scatterlist to find out if there are any unaligned entries; this is a
needless waste of CPU cycles.  Avoid this by checking for a non-read
tranfer first.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Tested-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

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Russell King 2016-01-26 13:40:06 +00:00 • committed by Ulf Hansson

parent acc3ad1383

commit 47fa961340

1 changed files with 22 additions and 20 deletions

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drivers/mmc/host/sdhci.c

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