linux-kernel - [PATCH] drm/dma: Drop unbalanced obj unref

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Date:   Thu, 19 Jan 2023 13:13:25 -0800
From:   Rob Clark <robdclark@...il.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     Rob Clark <robdclark@...omium.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] drm/dma: Drop unbalanced obj unref

From: Rob Clark <robdclark@...omium.org>

In the error path, drm_gem_dma_mmap() is dropping an obj reference that
it doesn't own.

Fixes: f5ca8eb6f9bd ("drm/cma-helper: Implement mmap as GEM CMA object functions")
Signed-off-by: Rob Clark <robdclark@...omium.org>
---
 drivers/gpu/drm/drm_gem_dma_helper.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_gem_dma_helper.c b/drivers/gpu/drm/drm_gem_dma_helper.c
index 1e658c448366..784356d6f39d 100644
--- a/drivers/gpu/drm/drm_gem_dma_helper.c
+++ b/drivers/gpu/drm/drm_gem_dma_helper.c
@@ -544,8 +544,6 @@ int drm_gem_dma_mmap(struct drm_gem_dma_object *dma_obj, struct vm_area_struct *
 				  dma_obj->dma_addr,
 				  vma->vm_end - vma->vm_start);
 	}
-	if (ret)
-		drm_gem_vm_close(vma);
 
 	return ret;
 }
-- 
2.38.1