From: Dave Airlie <airlied@redhat.com>
Date: Tue, 25 Mar 2014 04:38:44 +0000 (+1000)
Subject: drm/udl: take reference to device struct for dma-bufs
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=347cf10aed1657a2b385a95f92763a67062c5ad3;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

drm/udl: take reference to device struct for dma-bufs

this stops the device from being deleted before all the dma-bufs
on it are freed, this fixes an oops when you unplug a udl device while
it has imported a buffer from another device.

Signed-off-by: Dave Airlie <airlied@redhat.com>
---

diff --git a/drivers/gpu/drm/udl/udl_gem.c b/drivers/gpu/drm/udl/udl_gem.c
index 8d67b943ac05..0394811251bd 100644
--- a/drivers/gpu/drm/udl/udl_gem.c
+++ b/drivers/gpu/drm/udl/udl_gem.c
@@ -177,8 +177,10 @@ void udl_gem_free_object(struct drm_gem_object *gem_obj)
 	if (obj->vmapping)
 		udl_gem_vunmap(obj);
 
-	if (gem_obj->import_attach)
+	if (gem_obj->import_attach) {
 		drm_prime_gem_destroy(gem_obj, obj->sg);
+		put_device(gem_obj->dev->dev);
+	}
 
 	if (obj->pages)
 		udl_gem_put_pages(obj);
@@ -256,9 +258,12 @@ struct drm_gem_object *udl_gem_prime_import(struct drm_device *dev,
 	int ret;
 
 	/* need to attach */
+	get_device(dev->dev);
 	attach = dma_buf_attach(dma_buf, dev->dev);
-	if (IS_ERR(attach))
+	if (IS_ERR(attach)) {
+		put_device(dev->dev);
 		return ERR_CAST(attach);
+	}
 
 	get_dma_buf(dma_buf);
 
@@ -282,6 +287,6 @@ fail_unmap:
 fail_detach:
 	dma_buf_detach(dma_buf, attach);
 	dma_buf_put(dma_buf);
-
+	put_device(dev->dev);
 	return ERR_PTR(ret);
 }