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Date:   Wed, 28 Oct 2020 08:30:44 -0500
From:   Alex Elder <>
To:     Willem de Bruijn <>
Cc:     David Miller <>,
        Jakub Kicinski <>,,
        Subash Abhinov Kasiviswanathan <>,,,
        Network Development <>,
        linux-kernel <>
Subject: Re: [PATCH net 5/5] net: ipa: avoid going past end of resource group

On 10/27/20 7:14 PM, Willem de Bruijn wrote:
> On Tue, Oct 27, 2020 at 12:38 PM Alex Elder <> wrote:
>> The minimum and maximum limits for resources assigned to a given
>> resource group are programmed in pairs, with the limits for two
>> groups set in a single register.
>> If the number of supported resource groups is odd, only half of the
>> register that defines these limits is valid for the last group; that
>> group has no second group in the pair.
>> Currently we ignore this constraint, and it turns out to be harmless,
> If nothing currently calls it with an odd number of registers, is this
> a bugfix or a new feature (anticipating future expansion, I guess)?

. . .

Sorry, I missed this comment.  Yes, I'm working on support for
an upcoming IPA hardware version that has 5 resources of each
type.  And it is a bug fix, though the bug doesn't bite us
(because the maximum number of resources supported is even),
so "it turns out to be harmless."


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