RfC: Handle SPI controller limitations like maximum message length

[Mark Brown]

On Fri, Nov 20, 2015 at 07:59:37PM +0100, Heiner Kallweit wrote:

> OK, I interpret this as:
> Controller drivers shall return 0 only if the complete message was
> transferred successfully.

Yes.

> If  a controller driver returns an error it has the option to set
> actual_length to what was transferred successfully.

It should always do this.

> This means we can't use patch 4 from Michal because it bails out as soon
> as the underlying SPI transfer returns an error.

I haven't seen that patch.
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