Messages in this thread | | | Date | Tue, 30 Oct 2012 12:05:27 -0600 | From | Stephen Warren <> | Subject | Re: [PATCH V2] dma: tegra: avoid channel lock up after free |
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On 10/29/2012 05:20 PM, Dmitry Osipenko wrote: > Fixed channel "lock up" after free. > > Lock scenario: Channel 1 was allocated and prepared as slave_sg, used and freed. > Now preparation of cyclic dma on channel 1 will fail with err "DMA configuration > conflict" because tdc->isr_handler still selected to handle_once_dma_done. > > This happens because tegra_dma_abort_all() won't be called on channel freeing > if pending list is empty or channel not busy. We need to clear isr_handler > on channel freeing to avoid locking. Also I added small optimization to prepare > functions, so current channel type checked before making allocations.
Reviewed-by: Stephen Warren <swarren@nvidia.com>
I believe this looks OK. However, I would like Laxman to also ack/review this since he wrote the driver.
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