dmaengine: tegra-apb: Improve DMA synchronization

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Boot CPU0 always handles DMA interrupts and under some rare circumstances
it could stuck in uninterruptible state for a significant time (like in a
case of KASAN + NFS root). In this case sibling CPU, which waits for DMA
transfer completion, will get a DMA transfer timeout. In order to handle
this rare condition, interrupt status needs to be polled until interrupt
is handled.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20200319212321.3297-2-digetx@gmail.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

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Dmitry Osipenko 2020-03-20 00:23:21 +03:00 • committed by Vinod Koul

parent 6de88ea4ff

commit 6697255f23

1 changed files with 25 additions and 0 deletions

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drivers/dma/tegra20-apb-dma.c

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