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author | John Stultz <john.stultz@linaro.org> | 2019-12-18 19:09:06 +0000 |
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committer | Vinod Koul <vkoul@kernel.org> | 2019-12-23 13:21:14 +0530 |
commit | 2f42e05b942fe2fbfb9bbc6e34e1dd8c3ce4f3a4 (patch) | |
tree | c49ab418f77b856be416a1a17283359463d842c1 /drivers/nubus | |
parent | a40c94be2336f3002563c9ae16572143ae3422e2 (diff) | |
download | linux-2f42e05b942fe2fbfb9bbc6e34e1dd8c3ce4f3a4.tar.bz2 |
dmaengine: k3dma: Avoid null pointer traversal
In some cases we seem to submit two transactions in a row, which
causes us to lose track of the first. If we then cancel the
request, we may still get an interrupt, which traverses a null
ds_run value.
So try to avoid starting a new transaction if the ds_run value
is set.
While this patch avoids the null pointer crash, I've had some
reports of the k3dma driver still getting confused, which
suggests the ds_run/ds_done value handling still isn't quite
right. However, I've not run into an issue recently with it
so I think this patch is worth pushing upstream to avoid the
crash.
Signed-off-by: John Stultz <john.stultz@linaro.org>
[add ss tag]
Link: https://lore.kernel.org/r/20191218190906.6641-1-john.stultz@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/nubus')
0 files changed, 0 insertions, 0 deletions