3.5.7.3 -stable review patch. If anyone has any objections, please let me know.
------------------ From: Seung-Woo Kim <[email protected]> commit be8a42ae60addd8b6092535c11b42d099d6470ec upstream. Increasing ref counts of both dma-buf and gem for imported dma-buf come from gem makes memory leak. release function of dma-buf cannot be called because f_count of dma-buf increased by importing gem and gem ref count cannot be decrease because of exported dma-buf. So I add dma_buf_put() for imported gem come from its own gem into each drivers having prime_import and prime_export capabilities. With this, only gem ref count is increased if importing gem exported from gem of same driver. Signed-off-by: Seung-Woo Kim <[email protected]> Signed-off-by: Kyungmin.park <[email protected]> Cc: Inki Dae <[email protected]> Cc: Daniel Vetter <[email protected]> Cc: Rob Clark <[email protected]> Cc: Alex Deucher <[email protected]> Signed-off-by: Dave Airlie <[email protected]> Signed-off-by: Herton Ronaldo Krzesinski <[email protected]> --- drivers/gpu/drm/exynos/exynos_drm_dmabuf.c | 5 +++++ drivers/gpu/drm/i915/i915_gem_dmabuf.c | 5 +++++ drivers/gpu/drm/nouveau/nouveau_prime.c | 1 + drivers/gpu/drm/radeon/radeon_prime.c | 1 + drivers/staging/omapdrm/omap_gem_dmabuf.c | 5 +++++ 5 files changed, 17 insertions(+) diff --git a/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c b/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c index 2749092..e678be1 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c +++ b/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c @@ -199,7 +199,12 @@ struct drm_gem_object *exynos_dmabuf_prime_import(struct drm_device *drm_dev, /* is it from our device? */ if (obj->dev == drm_dev) { + /* + * Importing dmabuf exported from out own gem increases + * refcount on gem itself instead of f_count of dmabuf. + */ drm_gem_object_reference(obj); + dma_buf_put(dma_buf); return obj; } } diff --git a/drivers/gpu/drm/i915/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/i915_gem_dmabuf.c index 5d5493e..a233816 100644 --- a/drivers/gpu/drm/i915/i915_gem_dmabuf.c +++ b/drivers/gpu/drm/i915/i915_gem_dmabuf.c @@ -187,7 +187,12 @@ struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev, obj = dma_buf->priv; /* is it from our device? */ if (obj->base.dev == dev) { + /* + * Importing dmabuf exported from out own gem increases + * refcount on gem itself instead of f_count of dmabuf. + */ drm_gem_object_reference(&obj->base); + dma_buf_put(dma_buf); return &obj->base; } } diff --git a/drivers/gpu/drm/nouveau/nouveau_prime.c b/drivers/gpu/drm/nouveau/nouveau_prime.c index a25cf2c..bb653c6 100644 --- a/drivers/gpu/drm/nouveau/nouveau_prime.c +++ b/drivers/gpu/drm/nouveau/nouveau_prime.c @@ -199,6 +199,7 @@ struct drm_gem_object *nouveau_gem_prime_import(struct drm_device *dev, if (nvbo->gem) { if (nvbo->gem->dev == dev) { drm_gem_object_reference(nvbo->gem); + dma_buf_put(dma_buf); return nvbo->gem; } } diff --git a/drivers/gpu/drm/radeon/radeon_prime.c b/drivers/gpu/drm/radeon/radeon_prime.c index 6bef46a..d344a3be 100644 --- a/drivers/gpu/drm/radeon/radeon_prime.c +++ b/drivers/gpu/drm/radeon/radeon_prime.c @@ -195,6 +195,7 @@ struct drm_gem_object *radeon_gem_prime_import(struct drm_device *dev, bo = dma_buf->priv; if (bo->gem_base.dev == dev) { drm_gem_object_reference(&bo->gem_base); + dma_buf_put(dma_buf); return &bo->gem_base; } } diff --git a/drivers/staging/omapdrm/omap_gem_dmabuf.c b/drivers/staging/omapdrm/omap_gem_dmabuf.c index 42728e0..5b50eb6 100644 --- a/drivers/staging/omapdrm/omap_gem_dmabuf.c +++ b/drivers/staging/omapdrm/omap_gem_dmabuf.c @@ -207,7 +207,12 @@ struct drm_gem_object * omap_gem_prime_import(struct drm_device *dev, obj = buffer->priv; /* is it from our device? */ if (obj->dev == dev) { + /* + * Importing dmabuf exported from out own gem increases + * refcount on gem itself instead of f_count of dmabuf. + */ drm_gem_object_reference(obj); + dma_buf_put(buffer); return obj; } } -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
