linux-kernel - Re: [PATCH 02/13] dmaengine: Introduce dma_request_slave_channel_compat

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Date:	Fri, 29 May 2015 11:42:27 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Vinod Koul <vinod.koul@...el.com>
Cc:	Peter Ujfalusi <peter.ujfalusi@...com>,
	Tony Lindgren <tony@...mide.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Dan Williams <dan.j.williams@...el.com>,
	dmaengine@...r.kernel.org,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	Linux MMC List <linux-mmc@...r.kernel.org>,
	linux-crypto@...r.kernel.org,
	linux-spi <linux-spi@...r.kernel.org>,
	Linux Media Mailing List <linux-media@...r.kernel.org>,
	ALSA Development Mailing List <alsa-devel@...a-project.org>
Subject: Re: [PATCH 02/13] dmaengine: Introduce dma_request_slave_channel_compat_reason()

On Fri, May 29, 2015 at 11:33 AM, Vinod Koul <vinod.koul@...el.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().

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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