Hi Tomi,
Thank you for the patch.
On Friday 26 February 2016 11:35:57 Tomi Valkeinen wrote:
> omap_gem_attach_pages() calls dma_map_page() but does not check the
> possible error with dma_mapping_error(). If DMA-API debugging is
> enabled, the debug layer will give a warning if dma_mapping_error() has
> not been used.
>
> This patch adds proper error handling to omap_gem_attach_pages().
>
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxx>
Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/omapdrm/omap_gem.c | 15 +++++++++++++++
> 1 file changed, 15 insertions(+)
>
> diff --git a/drivers/gpu/drm/omapdrm/omap_gem.c
> b/drivers/gpu/drm/omapdrm/omap_gem.c index 8495a1a4b617..cb541d6b3c2b
> 100644
> --- a/drivers/gpu/drm/omapdrm/omap_gem.c
> +++ b/drivers/gpu/drm/omapdrm/omap_gem.c
> @@ -264,6 +264,19 @@ static int omap_gem_attach_pages(struct drm_gem_object
> *obj) for (i = 0; i < npages; i++) {
> addrs[i] = dma_map_page(dev->dev, pages[i],
> 0, PAGE_SIZE, DMA_BIDIRECTIONAL);
> +
> + if (dma_mapping_error(dev->dev, addrs[i])) {
> + dev_warn(dev->dev,
> + "%s: failed to map page\n", __func__);
> +
> + for (i = i - 1; i >= 0; --i) {
> + dma_unmap_page(dev->dev, addrs[i],
> + PAGE_SIZE, DMA_BIDIRECTIONAL);
> + }
> +
> + ret = -ENOMEM;
> + goto free_addrs;
> + }
> }
> } else {
> addrs = kzalloc(npages * sizeof(*addrs), GFP_KERNEL);
> @@ -278,6 +291,8 @@ static int omap_gem_attach_pages(struct drm_gem_object
> *obj)
>
> return 0;
>
> +free_addrs:
> + kfree(addrs);
> free_pages:
> drm_gem_put_pages(obj, pages, true, false);
--
Regards,
Laurent Pinchart
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