linux-kernel - Re: MT76x2U crashes XHCI driver on AMD Ryzen system

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Message-ID: <20190228134029.GC1594@8bytes.org>
Date:   Thu, 28 Feb 2019 14:40:29 +0100
From:   Joerg Roedel <joro@...tes.org>
To:     Stanislaw Gruszka <sgruszka@...hat.com>
Cc:     Lorenzo Bianconi <lorenzo.bianconi@...hat.com>,
        Rosen Penev <rosenp@...il.com>,
        linux-wireless <linux-wireless@...r.kernel.org>,
        Samuel Sieb <samuel@...b.net>,
        Alexander Duyck <alexander.h.duyck@...ux.intel.com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: MT76x2U crashes XHCI driver on AMD Ryzen system

On Thu, Feb 28, 2019 at 01:19:48PM +0100, Stanislaw Gruszka wrote:
> Nevermind, the patch is wrong, s->dma_address is initalized in sg_num_pages().

Yes, it is. In sg_num_pages() the offset into the IOMMU mapping is
stored in s->dma_address, taking also the segment boundary mask into
account. map_sg() later only adds the base-address to that.

Regards,

	Joerg