serial: samsung: fix DMA mode enter condition for small FIFO sizes

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commit 81ccb2a69f upstream.

Due to some of serial ports can have FIFO size smaller than cache line
size, and because of need to align DMA buffer address to cache line size,
it's necessary to calculate minimum number of bytes for which we want
to start DMA transaction to be at least cache line size. The simplest
way to meet this requirement is to get maximum of cache line size and
FIFO size.

Reported-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Marek Szyprowski 2015-07-31 10:58:27 +02:00 • committed by Greg Kroah-Hartman

parent 5fe45c8dbe

commit da5b2f0abe

2 changed files with 12 additions and 2 deletions

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13

drivers/tty/serial/samsung.c

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1

drivers/tty/serial/samsung.h

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