Re: [PATCH v4 4/7] dmaengine: dw: calculate residue separately from completion

[sashiko-bot@kernel.org]

> From: Serge Semin <fancer.lancer@gmail.com>
> 
> The descriptor scanner mixes transfer-complete handling with hardware-LLP
> residue calculation. A status query needs the latter for the requested
> cookie even when no transfer-complete event is pending.
> 
> Move hardware-LLP residue calculation into its own helper and call it from
> the status getter under the channel lock. Keep software-LLP progress in
> the scanner and subtract the current block's progress when reporting its
> residue. The scanner now handles transfer-complete events only, retaining
> the distinction between zero source residue and destination completion.
> 
> Also search the queued descriptors so a transfer waiting to start reports
> its full length instead of zero residue.
> 
> 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 report queued residue]
> Signed-off-by: James Hilliard <james.hilliard1@gmail.com>

Sashiko has reviewed this patch and found no issues.

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20261029-submit-dw-dma-synchronize-v1-v4-0-fea447d9f285@gmail.com?part=4