Re: [PATCH 02/13] dmaengine: Introduce dma_request_slave_channel_compat_reason()

Vinod Koul
2015-05-29T10:18:02Z

On Fri, May 29, 2015 at 11:42:27AM +0200, Geert Uytterhoeven wrote:
> On Fri, May 29, 2015 at 11:33 AM, Vinod Koul <vinod.koul@intel.com> wrote:
> > On Tue, May 26, 2015 at 04:25:57PM +0300, Peter Ujfalusi wrote:
> >> dma_request_slave_channel_compat() 'eats' up the returned error codes which
> >> prevents drivers using the compat call to be able to do deferred probing.
> >>
> >> The new wrapper is identical in functionality but it will return with error
> >> code in case of failure and will pass the -EPROBE_DEFER to the caller in
> >> case dma_request_slave_channel_reason() returned with it.
> > This is okay but am worried about one more warpper, how about fixing
> > dma_request_slave_channel_compat()
>
> Then all callers of dma_request_slave_channel_compat() have to be
> modified to handle ERR_PTR first.
>
> The same is true for (the existing) dma_request_slave_channel_reason()
> vs. dma_request_slave_channel().
Good point, looking again, I think we should rather fix
dma_request_slave_channel_reason() as it was expected to return err code and
add new users. Anyway users of this API do expect the reason...

--
~Vinod