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| author | Dmitry Osipenko <digetx@gmail.com> | 2020-03-20 00:23:21 +0300 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2020-03-23 12:06:24 +0530 |
| commit | 6697255f239f5c04fcd6b819c0d35ae05bbf808c (patch) | |
| tree | a12b493edca015d1c30d63d6ef0d8c055760587b /drivers/dma/uniphier-xdmac.c | |
| parent | 6de88ea4ff665040e62e3b3ffea01e388ae09ac0 (diff) | |
| download | lwn-6697255f239f5c04fcd6b819c0d35ae05bbf808c.tar.gz lwn-6697255f239f5c04fcd6b819c0d35ae05bbf808c.zip | |
dmaengine: tegra-apb: Improve DMA synchronization
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>
Diffstat (limited to 'drivers/dma/uniphier-xdmac.c')
0 files changed, 0 insertions, 0 deletions