linux-kernel - Re: [PATCH 1/1] s390/virtio_ccw: fix dma

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Message-ID: <20241008115003.7472-G-hca@linux.ibm.com>
Date: Tue, 8 Oct 2024 13:50:03 +0200
From: Heiko Carstens <hca@...ux.ibm.com>
To: Halil Pasic <pasic@...ux.ibm.com>
Cc: Cornelia Huck <cohuck@...hat.com>, Eric Farman <farman@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Robin Murphy <robin.murphy@....com>,
        Ulf Hansson <ulf.hansson@...aro.org>, linux-s390@...r.kernel.org,
        virtualization@...ts.linux.dev, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Marc Hartmayer <mhartmay@...ux.ibm.com>
Subject: Re: [PATCH 1/1] s390/virtio_ccw: fix dma_parm pointer not set up

On Mon, Oct 07, 2024 at 10:10:30PM +0200, Halil Pasic wrote:
> At least since commit 334304ac2bac ("dma-mapping: don't return errors
> from dma_set_max_seg_size") setting up device.dma_parms is basically
> mandated by the DMA API. As of now Channel (CCW) I/O in general does not
> utilize the DMA API, except for virtio. For virtio-ccw however the
> common virtio DMA infrastructure is such that most of the DMA stuff
> hinges on the virtio parent device, which is a CCW device.
> 
> So lets set up the dma_parms pointer for the CCW parent device and hope
> for the best!
> 
> Signed-off-by: Halil Pasic <pasic@...ux.ibm.com>
> Fixes: 334304ac2bac ("dma-mapping: don't return errors from dma_set_max_seg_size")
> Reported-by: "Marc Hartmayer" <mhartmay@...ux.ibm.com>
> Closes: https://bugzilla.linux.ibm.com/show_bug.cgi?id=209131
> Reviewed-by: Eric Farman <farman@...ux.ibm.com>
> ---

Applied, thanks!