linux-kernel - Re: [PATCH] drm/tinydrm: mipi-dbi: Fix unbalanced DMA access

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Date:   Wed, 2 Aug 2017 20:51:37 +0200
From:   Noralf Trønnes <noralf@...nnes.org>
To:     David Lechner <david@...hnology.com>,
        dri-devel@...ts.freedesktop.org
Cc:     David Airlie <airlied@...ux.ie>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/tinydrm: mipi-dbi: Fix unbalanced DMA access


Den 01.08.2017 22.14, skrev David Lechner:
> If we return here and import_attach is true, then dma_buf_end_cpu_access()
> will not be called balance dma_buf_begin_cpu_access().
>
> Fix by setting ret instead of returning.
>
> Signed-off-by: David Lechner <david@...hnology.com>
> ---

Reviewed-by: Noralf Trønnes <noralf@...nnes.org>

>   drivers/gpu/drm/tinydrm/mipi-dbi.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/tinydrm/mipi-dbi.c b/drivers/gpu/drm/tinydrm/mipi-dbi.c
> index c83eeb7..e10fa4b 100644
> --- a/drivers/gpu/drm/tinydrm/mipi-dbi.c
> +++ b/drivers/gpu/drm/tinydrm/mipi-dbi.c
> @@ -183,7 +183,8 @@ static int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,
>   		dev_err_once(fb->dev->dev, "Format is not supported: %s\n",
>   			     drm_get_format_name(fb->format->format,
>   						 &format_name));
> -		return -EINVAL;
> +		ret = -EINVAL;
> +		break;
>   	}
>   
>   	if (import_attach)