linux-kernel - Re: [PATCH 2/9] nouveau: reset dma_nr in nouveau_dmem_migrate_alloc_and

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Date:   Mon, 29 Jul 2019 16:18:12 -0700
From:   Ralph Campbell <rcampbell@...dia.com>
To:     Christoph Hellwig <hch@....de>,
        Jérôme Glisse <jglisse@...hat.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Ben Skeggs <bskeggs@...hat.com>
CC:     Bharata B Rao <bharata@...ux.ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        <linux-mm@...ck.org>, <nouveau@...ts.freedesktop.org>,
        <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/9] nouveau: reset dma_nr in
 nouveau_dmem_migrate_alloc_and_copy


On 7/29/19 7:28 AM, Christoph Hellwig wrote:
> When we start a new batch of dma_map operations we need to reset dma_nr,
> as we start filling a newly allocated array.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>

Reviewed-by: Ralph Campbell <rcampbell@...dia.com>

> ---
>   drivers/gpu/drm/nouveau/nouveau_dmem.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/nouveau/nouveau_dmem.c b/drivers/gpu/drm/nouveau/nouveau_dmem.c
> index 38416798abd4..e696157f771e 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_dmem.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_dmem.c
> @@ -682,6 +682,7 @@ nouveau_dmem_migrate_alloc_and_copy(struct vm_area_struct *vma,
>   	migrate->dma = kmalloc(sizeof(*migrate->dma) * npages, GFP_KERNEL);
>   	if (!migrate->dma)
>   		goto error;
> +	migrate->dma_nr = 0;
>   
>   	/* Copy things over */
>   	copy = drm->dmem->migrate.copy_func;
>