On 24/02/16 00:10, Laurent Pinchart wrote:
> Hi Tomi,
>
> Thank you for the patch.
>
> On Friday 19 February 2016 11:47:46 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>
>> ---
>> drivers/gpu/drm/omapdrm/omap_gem.c | 14 ++++++++++++++
>> 1 file changed, 14 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/omapdrm/omap_gem.c
>> b/drivers/gpu/drm/omapdrm/omap_gem.c index 8495a1a4b617..7098190815f1
>> 100644
>> --- a/drivers/gpu/drm/omapdrm/omap_gem.c
>> +++ b/drivers/gpu/drm/omapdrm/omap_gem.c
>> @@ -264,6 +264,18 @@ 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, "omap_gem_attach_pages: dma_map_page
> failed\n");
>
> Using dev_warn(dev->dev, "%s: failed to map page\n", __func__); and proper
> line breaks you'll have no trouble complying with the 80 characters per line
> limit :-)
Ok.
>> +
>> + for (i = i - 1; i >= 0; --i) {
>
> Maybe i-- instead of i = i - 1 ?
Hmm I don't know... I do like assignment in the initializer more than
i--. And why i--? Why not --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);
>> @@ -277,6 +289,8 @@ static int omap_gem_attach_pages(struct drm_gem_object
>> *obj) omap_obj->pages = pages;
>>
>> return 0;
>> +free_addrs:
>> + kfree(addrs);
>>
>
> I'd move this blank line before free_addrs.
Yes, that makes it cleaner.
Tomi
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