linux-kernel - Re: [PATCHv3 3/4] iommu/tegra: smmu: Refrain from accessing to AHB registers

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Date:	Thu, 26 Apr 2012 13:58:32 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Hiroshi DOYU <hdoyu@...dia.com>
CC:	swarren@...dia.com, Joerg Roedel <joerg.roedel@....com>,
	Thierry Reding <thierry.reding@...onic-design.de>,
	linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCHv3 3/4] iommu/tegra: smmu: Refrain from accessing to AHB
 registers

On 04/25/2012 05:07 AM, Hiroshi DOYU wrote:
> Use "tegra_ahb_enable_smmu()" to inform AHB that SMMU is
> ready, instead of directly aceessing AHB registers.

> @@ -397,11 +384,7 @@ static void smmu_setup_regs(struct smmu_device *smmu)
...
> +	tegra_ahb_enable_smmu();

You need to check for an error there, and make smmu_setup_regs()
propagate any error back to its callers and check it there too.
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