linux-kernel - Re: [PATCH 2/2] dma: add Qualcomm Technologies HIDMA channel driver

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Date:	Fri, 30 Oct 2015 17:36:45 -0500
From:	Timur Tabi <timur@...eaurora.org>
To:	Arnd Bergmann <arnd@...db.de>, Sinan Kaya <okaya@...eaurora.org>
Cc:	dmaengine@...r.kernel.org, cov@...eaurora.org, jcm@...hat.com,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Vinod Koul <vinod.koul@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] dma: add Qualcomm Technologies HIDMA channel driver

On 10/30/2015 05:28 PM, Arnd Bergmann wrote:
>>> > >Why ENODEV? Could you make this handle restarted system calls?
>> >
>> >This is the self test code. It gets called from probe. If there is a
>> >problem with the device or system configuration, I don't want to enable
>> >this device. I can certainly return a different error code though.
>> >What's a good code?
> I see. probe() is not restartable, so it cannot be -ERESTARTSYS.
>
> Maybe better use wait_event_timeout and not handle the signals then.
> It will eventually time out if something goes wrong.

What about -EPROBE_DEFER?  Isn't that "restartable"?  Granted, it's only 
supposed to be used if the driver is dependent on another driver to 
probe, so I'm not sure it applies here.  If the self-test fails, then it 
is possible that it could succeed later?

-- 
Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.
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