[Bug 214621] WARNING: CPU: 3 PID: 521 at drivers/gpu/drm/ttm/ttm_bo.c:409 ttm_bo_release+0xb64/0xe40 [ttm]

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=214621

--- Comment #11 from Christian König (christian.koenig@amd.com) ---
Well it's really appreciated that you are looking into this.

One thing we might want to do is to move the warning in dma_buf_release():

diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index 3f63d58bf68a..6ecc01585cf4 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -75,6 +75,7 @@ static void dma_buf_release(struct dentry *dentry)
         * dma-buf while still having pending operation to the buffer.
         */
        BUG_ON(dmabuf->cb_in.active || dmabuf->cb_out.active);
+       WARN_ON(!list_empty(&dmabuf->attachments));

        dma_buf_stats_teardown(dmabuf);
        dmabuf->ops->release(dmabuf);
@@ -82,7 +83,6 @@ static void dma_buf_release(struct dentry *dentry)
        if (dmabuf->resv == (struct dma_resv *)&dmabuf[1])
                dma_resv_fini(dmabuf->resv);

-       WARN_ON(!list_empty(&dmabuf->attachments));
        module_put(dmabuf->owner);
        kfree(dmabuf->name);
        kfree(dmabuf);

This way users get the dma-buf warning first and maybe a bit less confused.

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