RE: [PATCH v6 01/18] dmaengine: sh: rz-dmac: Move interrupt request after everything is set up

[Biju Das]

Hi Claudiu,

> -----Original Message-----
> From: Claudiu Beznea <claudiu.beznea@xxxxxxxxxx>
> Sent: 26 May 2026 10:46
> Subject: Re: [PATCH v6 01/18] dmaengine: sh: rz-dmac: Move interrupt request after everything is set
> up
> 
> 
> 
> On 5/26/26 11:54, Biju Das wrote:
> > Hi Claudiu,
> >
> >> -----Original Message-----
> >> From: Claudiu Beznea <claudiu.beznea@xxxxxxxxxx>
> >> Sent: 26 May 2026 09:47
> >> Subject: [PATCH v6 01/18] dmaengine: sh: rz-dmac: Move interrupt
> >> request after everything is set up
> >>
> >> From: Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx>
> >>
> >> Once the interrupt is requested, the interrupt handler may run immediately.
> >
> > Do you mean spurious interrupt?
> >
> > After DMA driver probe only, consumer device can access the DMA handle
> > right? or am I missing something here?
> 
> In theory there could be pending interrupts not yet served (e.g. due to the previous usage of the
> controller, HW behavior, etc). Those could trigger the execution of the IRQ handler once the interrupt
> is requested.

You mean DMA consumers configured by bootloader and linux probing the DMA driver can
trigger IRQ? 

Cheers,
Biju