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drm/omap: return error if dma_alloc_writecombine fails

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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@ti.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Tomi Valkeinen 2015-03-17 15:31:11 +02:00
parent 5f741b39dd
commit a903e3b64a
1 changed files with 11 additions and 7 deletions
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18
drivers/gpu/drm/omapdrm/omap_gem.c
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@ -1378,11 +1378,7 @@ struct drm_gem_object *omap_gem_new(struct drm_device *dev,
omap_obj = kzalloc(sizeof(*omap_obj), GFP_KERNEL);
if (!omap_obj)
goto fail;
spin_lock(&priv->list_lock);
list_add(&omap_obj->mm_list, &priv->obj_list);
spin_unlock(&priv->list_lock);
return NULL;
obj = &omap_obj->base;
@ -1392,11 +1388,19 @@ 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) {
kfree(omap_obj);
return NULL;
}
flags |= OMAP_BO_DMA;
}
spin_lock(&priv->list_lock);
list_add(&omap_obj->mm_list, &priv->obj_list);
spin_unlock(&priv->list_lock);
omap_obj->flags = flags;
if (flags & OMAP_BO_TILED) {