Re: [PATCH] dmaengine: rcar-dmac: Reject zero-length slave DMA requests

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Hi Geert,

On Fri, Jun 28, 2019 at 02:10:01PM +0200, Geert Uytterhoeven wrote:
> On Wed, Jun 26, 2019 at 8:15 PM Eugeniu Rosca <roscaeugeniu@xxxxxxxxx> wrote:
[..]
> I'm not such a big fan of WARN()...
[..]
> > rcar-dmac e7300000.dma-controller: rcar_dmac_prep_slave_sg: bad parameter: len=1, id=19
> 
> Which would be followed by
> 
>     sh-sci e6e88000.serial: Failed preparing Tx DMA descriptor
> 
> pointing to the sh-sci driver, right?
> 
> The id=19 points to channel 0x13, i.e. SCIF2, according to
> arch/arm64/boot/dts/renesas/r8a7795.dtsi.

Thank you for the detailed rationale. Much appreciated.

FTR, the patch landed in vkoul/slave-dma.git, as commit
https://git.kernel.org/pub/scm/linux/kernel/git/vkoul/slave-dma.git/commit/?h=next&id=78efb76ab4dfb8f
("dmaengine: rcar-dmac: Reject zero-length slave DMA requests")

-- 
Best Regards,
Eugeniu.



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