netdev - Re: [Linaro-acpi] [V2 PATCH 2/5] arm64 : Introduce support for ACPI _CCA object

Open Source and information security mailing list archives

Date:	Tue, 5 May 2015 11:24:03 -0500
From:	Tom Lendacky <thomas.lendacky@....com>
To:	Suravee Suthikulanit <suravee.suthikulpanit@....com>,
	Arnd Bergmann <arnd@...db.de>, <linaro-acpi@...ts.linaro.org>
CC:	<rjw@...ysocki.net>, <herbert@...dor.apana.org.au>,
	<catalin.marinas@....com>, <will.deacon@....com>,
	<linux-kernel@...r.kernel.org>, <linux-acpi@...r.kernel.org>,
	<linux-crypto@...r.kernel.org>, <netdev@...r.kernel.org>,
	<davem@...emloft.net>, <linux-arm-kernel@...ts.infradead.org>,
	<lenb@...nel.org>
Subject: Re: [Linaro-acpi] [V2 PATCH 2/5] arm64 : Introduce support for ACPI
 _CCA object

On 05/05/2015 11:13 AM, Suravee Suthikulanit wrote:
> On 5/5/2015 11:12 AM, Arnd Bergmann wrote:
>> On Tuesday 05 May 2015 11:09:38 Suravee Suthikulanit wrote:
>>>
>>> However, codes in several places are making use of dma_map_ops without
>>> checking if the ops are NULL (i.e.
>>> include/asm-generic/dma-mapping-common.h and in arch-specific
>>> implementation). If setting it to NULL is what we are planning to
>>> support, we would need to scrub the current code to put NULL check.
>>> Also, would you consider if that is safe to do going forward?
>>>
>>>
>>
>> I mean the dma_mask pointer, not dma_map_ops.

Except a lot of drivers will actually set the dma_mask pointer during
probe (usually by setting dev->dma_mask = &dev->coherent_dma_mask or by
calling dma_coerce_mask_and_coherent).  So I think the dummy_dma_ops
might be the safest way to go.

Thanks,
Tom

>>
>>     Arnd
>>
>
> Ah, got it. Sorry for confusion.
>
> Suravee
>
> _______________________________________________
> Linaro-acpi mailing list
> Linaro-acpi@...ts.linaro.org
> https://lists.linaro.org/mailman/listinfo/linaro-acpi
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives