From: Arnd Bergmann <arnd@arndb.de>
To: linaro-acpi@lists.linaro.org
Cc: Suravee Suthikulanit <suravee.suthikulpanit@amd.com>,
        linux-arm-kernel@lists.infradead.org, herbert@gondor.apana.org.au,
        catalin.marinas@arm.com, rjw@rjwysocki.net,
        linux-kernel@vger.kernel.org, will.deacon@arm.com,
        linux-crypto@vger.kernel.org, linux-acpi@vger.kernel.org,
        netdev@vger.kernel.org, davem@davemloft.net, lenb@kernel.org
Subject: Re: [Linaro-acpi] [V2 PATCH 2/5] arm64 : Introduce support for ACPI _CCA object
Date: Tue, 05 May 2015 18:12:06 +0200
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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.

	Arnd
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