linux-kernel - Re: [PATCH v2 0/2] bnx2: Wait for in-flight DMA to complete at probe stage

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Date:   Mon, 14 Nov 2016 12:28:38 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     pmenzel@...gen.mpg.de
Cc:     bhe@...hat.com, netdev@...r.kernel.org, michael.chan@...adcom.com,
        linux-kernel@...r.kernel.org, Dept-GELinuxNICDev@...ium.com,
        rasesh.mody@...ium.com, harish.patil@...ium.com,
        frank@...ermydesk.org, jsr@....edzone.net, jroedel@...e.de,
        dyoung@...hat.com
Subject: Re: [PATCH v2 0/2] bnx2: Wait for in-flight DMA to complete at
 probe stage

From: Paul Menzel <pmenzel@...gen.mpg.de>
Date: Mon, 14 Nov 2016 09:25:47 +0100

> Dear Baoquan,
> 
> On 11/13/16 06:01, Baoquan He wrote:
>> This is v2 post.
>>
>> In commit 3e1be7a ("bnx2: Reset device during driver initialization"),
>> firmware requesting code was moved from open stage to probe stage.
>> The reason is in kdump kernel hardware iommu need device be reset in
>> driver probe stage, otherwise those in-flight DMA from 1st kernel
>> will continue going and look up into the newly created io-page tables.
>> However bnx2 chip resetting involves firmware requesting issue, that
>> need be done in open stage.
>>
>> Michale Chan suggested we can just wait for the old in-flight DMA to
>> complete at probe stage, then though without device resetting, we
>> don't need to worry the old in-flight DMA could continue looking up
>> the newly created io-page tables.
>>
>> v1->v2:
>>     Michael suggested to wait for the in-flight DMA to complete at probe
>>     stage. So give up the old method of trying to reset chip at probe
>>     stage, take the new way accordingly.
> 
> thank you for posting the updated series. Could you please resend a v3
> with stable@...r.kernel.org added [1]?

This is not the proper procedure for networking patches.