Patch "drm/prime: Pass the right module owner through to dma_buf_export()" has been added to the 4.8-stable tree

Patch "drm/prime: Pass the right module owner through to dma_buf_export()" has been added to the 4.8-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    drm/prime: Pass the right module owner through to dma_buf_export()

to the 4.8-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-prime-pass-the-right-module-owner-through-to-dma_buf_export.patch
and it can be found in the queue-4.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 56a76c0123d6cb034975901c80fce2627338ef9e Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Wed, 5 Oct 2016 13:21:43 +0100
Subject: drm/prime: Pass the right module owner through to dma_buf_export()
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

From: Chris Wilson <chris@chris-wilson.co.uk>

commit 56a76c0123d6cb034975901c80fce2627338ef9e upstream.

dma_buf_export() adds a reference to the owning module to the dmabuf (to
prevent the driver from being unloaded whilst a third party still refers
to the dmabuf). However, drm_gem_prime_export() was passing its own
THIS_MODULE (i.e. drm.ko) rather than the driver. Extract the right
owner from the device->fops instead.

v2: Use C99 initializers to zero out unset elements of
dma_buf_export_info
v3: Extract the right module from dev->fops.

Testcase: igt/vgem_basic/unload
Reported-by: Petri Latvala <petri.latvala@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Petri Latvala <petri.latvala@intel.com>
Cc: Christian König <christian.koenig@amd.com>
Tested-by: Petri Latvala <petri.latvala@intel.com>
Reviewed-by: Petri Latvala <petri.latvala@intel.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20161005122145.1507-1-chris@chris-wilson.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/drm_prime.c |   17 ++++++++++-------
 include/drm/drmP.h          |    3 ++-
 2 files changed, 12 insertions(+), 8 deletions(-)

--- a/drivers/gpu/drm/drm_prime.c
+++ b/drivers/gpu/drm/drm_prime.c
@@ -335,14 +335,17 @@ static const struct dma_buf_ops drm_gem_
  * using the PRIME helpers.
  */
 struct dma_buf *drm_gem_prime_export(struct drm_device *dev,
-				     struct drm_gem_object *obj, int flags)
+				     struct drm_gem_object *obj,
+				     int flags)
 {
-	DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
-
-	exp_info.ops = &drm_gem_prime_dmabuf_ops;
-	exp_info.size = obj->size;
-	exp_info.flags = flags;
-	exp_info.priv = obj;
+	struct dma_buf_export_info exp_info = {
+		.exp_name = KBUILD_MODNAME, /* white lie for debug */
+		.owner = dev->driver->fops->owner,
+		.ops = &drm_gem_prime_dmabuf_ops,
+		.size = obj->size,
+		.flags = flags,
+		.priv = obj,
+	};
 
 	if (dev->driver->gem_prime_res_obj)
 		exp_info.resv = dev->driver->gem_prime_res_obj(obj);
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -938,7 +938,8 @@ static inline int drm_debugfs_remove_fil
 #endif
 
 extern struct dma_buf *drm_gem_prime_export(struct drm_device *dev,
-		struct drm_gem_object *obj, int flags);
+					    struct drm_gem_object *obj,
+					    int flags);
 extern int drm_gem_prime_handle_to_fd(struct drm_device *dev,
 		struct drm_file *file_priv, uint32_t handle, uint32_t flags,
 		int *prime_fd);


Patches currently in stable-queue which might be from chris@chris-wilson.co.uk are

queue-4.8/drm-prime-pass-the-right-module-owner-through-to-dma_buf_export.patch