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Re: [PATCH v2 03/10] iwlwifi: pcie: work around DMA hardware bug

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To: Justin Capella <justincapella@xxxxxxxxx>, Luca Coelho <luca@xxxxxxxxx>
Subject: Re: [PATCH v2 03/10] iwlwifi: pcie: work around DMA hardware bug
From: Johannes Berg <johannes@xxxxxxxxxxxxxxxx>
Date: Thu, 02 Jan 2020 10:21:43 +0100
Cc: Kalle Valo <kvalo@xxxxxxxxxxxxxx>, linux-wireless@xxxxxxxxxxxxxxx
In-reply-to: <CAMrEMU-qALUNn3njYxomD_2GYUV3MHSTuwjfrC_AFaWybqi3qw@mail.gmail.com> (sfid-20191228_212644_892554_0B0892C8)
References: <20191220115638.1299888-4-luca@coelho.fi> <20191223093250.1445654-1-luca@coelho.fi> <CAMrEMU-qALUNn3njYxomD_2GYUV3MHSTuwjfrC_AFaWybqi3qw@mail.gmail.com> (sfid-20191228_212644_892554_0B0892C8)
User-agent: Evolution 3.34.2 (3.34.2-1.fc31)

Hi Justin,

Please trim your quotes and reply appropriately.

On Sat, 2019-12-28 at 12:26 -0800, Justin Capella wrote:
> Would using phys+len & ~dev->dma_mask work in place of the 4g boundary check

No. Look at the value of dma_mask, and the nature of the bug.

johannes

References:
- [PATCH v5.5 03/10] iwlwifi: pcie: work around DMA hardware bug
  - From: Luca Coelho
- [PATCH v2 03/10] iwlwifi: pcie: work around DMA hardware bug
  - From: Luca Coelho
- Re: [PATCH v2 03/10] iwlwifi: pcie: work around DMA hardware bug
  - From: Justin Capella

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