linux-kernel - Re: [PATCH] ACPI/IORT: Fix iort_node_get

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Message-ID: <8f8816bf-1a29-ca28-79f3-7bc1b9e9fb5c@codeaurora.org>
Date:   Thu, 5 Jan 2017 13:37:22 -0500
From:   Sinan Kaya <okaya@...eaurora.org>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        linux-acpi@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Hanjun Guo <hanjun.guo@...aro.org>,
        Tomasz Nowicki <tn@...ihalf.com>,
        Nate Watterson <nwatters@...eaurora.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>
Subject: Re: [PATCH] ACPI/IORT: Fix iort_node_get_id() mapping entries
 indexing

On 1/5/2017 1:29 PM, Lorenzo Pieralisi wrote:
> iort_node_get_id() takes an index as input to refer to a specific
> mapping entry in the mapping array to retrieve the id at a specific
> index provided the index is below the total mapping count; currently the
> index is used to retrieve the mapping value from the correct entry but
> not to dereference the correct entry while retrieving the mapping
> output_reference (ie IORT parent pointer), which consequently always
> resolves to the output_reference of the first entry in the mapping
> array.

Maybe, irrelevant but I'm going to throw it out.

Can we somehow break these multiple input and multiple output single
function into smaller and manageable pieces while we are fixing a bug
on it?

These functions seem to do N different things when an input is present
or not. 

I got lost in these function when implementing ITS->SMMU->NC use case.

-- 
Sinan Kaya
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.