Hi Tomi,
Thank you for the patch.
On Thursday 18 June 2015 13:10:35 Tomi Valkeinen wrote:
> On a platform with no TILER (e.g. omap3, am43xx), when the user wants to
> allocate buffer with flag OMAP_BO_SCANOUT, the buffer needs to be
> allocated with dma_alloc_writecombine. For some reason the driver does
> not return an error if that alloc fails, instead it continues without
> backing memory. This leads to errors later when the user tries to use
> the buffer.
>
> This patch makes the driver return an error if dma_alloc_writecombine
> fails.
>
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen at ti.com>
> ---
> drivers/gpu/drm/omapdrm/omap_gem.c | 12 ++++++++++--
> 1 file changed, 10 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/omapdrm/omap_gem.c
> b/drivers/gpu/drm/omapdrm/omap_gem.c index 2ab77801cf5f..51c5635aff62
> 100644
> --- a/drivers/gpu/drm/omapdrm/omap_gem.c
> +++ b/drivers/gpu/drm/omapdrm/omap_gem.c
> @@ -1392,9 +1392,17 @@ struct drm_gem_object *omap_gem_new(struct drm_device
> *dev, */
> omap_obj->vaddr = dma_alloc_writecombine(dev->dev, size,
> &omap_obj->paddr, GFP_KERNEL);
> - if (omap_obj->vaddr)
> - flags |= OMAP_BO_DMA;
> + if (!omap_obj->vaddr) {
> + spin_lock(&priv->list_lock);
> + list_del(&omap_obj->mm_list);
> + spin_unlock(&priv->list_lock);
Wouldn't it be simpler to move the list_add after the "if ((flags &
OMAP_BO_SCANOUT) && !priv->has_dmm)" block ? You could then avoid the
list_del.
> + kfree(omap_obj);
> +
> + return NULL;
> + }
> +
> + flags |= OMAP_BO_DMA;
> }
>
> omap_obj->flags = flags;
--
Regards,
Laurent Pinchart
