linux-kernel - Re: [sparc-next] SPARC64: Fix sun4v DMA panic

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Message-Id: <20170712.081320.21515285122907934.davem@davemloft.net>
Date:   Wed, 12 Jul 2017 08:13:20 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     tushar.n.dave@...cle.com
Cc:     chris.hyser@...cle.com, sowmini.varadhan@...cle.com,
        egtvedt@...fundet.no, dan.carpenter@...cle.com, krzk@...nel.org,
        bart.vanassche@...disk.com, sparclinux@...r.kernel.org,
        linux-kernel@...r.kernel.org, hch@....de, mroos@...ux.ee
Subject: Re: [sparc-next] SPARC64: Fix sun4v DMA panic

From: Tushar Dave <tushar.n.dave@...cle.com>
Date: Tue, 11 Jul 2017 14:34:47 -0700

> 64bit DMA only supported on sun4v equipped with ATU IOMMU HW.
> 'Commit b02c2b0bfd7ae ("sparc: remove arch specific dma_supported
> implementations")' introduced a code that incorrectly allow
> dma_supported() to succeed for 64bit dma mask even if system doesn't
> have ATU IOMMU. This results into panic.
> 
> Fix it.
> 
> Reported-by: Meelis Roos <mroos@...ux.ee>
> Signed-off-by: Tushar Dave <tushar.n.dave@...cle.com>

Applied to the 'sparc' tree, thanks.