Re: [PATCH v5 05/10] dmaengine: dw: calculate residue in the status getter

[sashiko-bot@kernel.org]

> From: Serge Semin <fancer.lancer@gmail.com>
> 
> Calculate hardware-LLP residue while looking up the requested cookie under
> the channel lock. The scanner and the status getter currently take that
> lock separately, allowing a descriptor to start between the scanner's
> residue update and the status query.
> 
> Have dwc_get_hard_llp_desc_residue() return a local residue value from a
> fresh LLP snapshot. Keep the persistent residue field for software-LLP
> block accounting, subtracting the current block's progress when reporting
> status. The descriptor scanner continues to advance software-LLP blocks
> and complete cookies from RAW.XFER, including for polled transfers.
> 
> Fixes: 3bfb1d20b547 ("dmaengine: Driver for the Synopsys DesignWare DMA controller")
> Cc: stable@vger.kernel.org
> Signed-off-by: Serge Semin <fancer.lancer@gmail.com>
> [james: retain polled completion and software-LLP progress]
> Signed-off-by: James Hilliard <james.hilliard1@gmail.com>

Sashiko has reviewed this patch and found no issues.

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Sashiko AI review · https://sashiko.dev/#/patchset/20261102-submit-dw-dma-synchronize-v1-v5-0-d3207758fbf9@gmail.com?part=5