On Wed, Jul 29, 2026 at 11:27 PM Baineng Shou shoubaineng@gmail.com wrote:

drm_gem_prime_handle_to_fd() open-codes fd reservation and install using get_unused_fd_flags() + fd_install() directly. This bypasses the DMA_BUF_TRACE() call that dma_buf_fd() emits, so observability tools relying on the trace_dma_buf_fd tracepoint silently miss all DRM PRIME exports.

Replace the bare fd_install() with dma_buf_fd_install(), which wraps fd_install() together with DMA_BUF_TRACE(), restoring full tracepoint coverage. No functional change; the fd lifecycle (get_unused_fd_flags → work → install) is already correct.

Note: this patch depends on dma_buf_fd_install() introduced in "dma-buf: dma-heap: don't publish fd before copy_to_user() succeeds" [1].

[1] https://lore.kernel.org/dri-devel/20260714114654.3885457-2-shoubaineng@gmail...

Suggested-by: Christian König christian.koenig@amd.com Signed-off-by: Baineng Shou shoubaineng@gmail.com

Reviewed-by: T.J. Mercier tjmercier@google.com

---

drivers/gpu/drm/drm_prime.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c index 9b44c78cd77f..fe3436d1235d 100644 --- a/drivers/gpu/drm/drm_prime.c +++ b/drivers/gpu/drm/drm_prime.c @@ -524,7 +524,7 @@ int drm_gem_prime_handle_to_fd(struct drm_device *dev, return PTR_ERR(dmabuf); }

•   fd_install(fd, dmabuf->file);
  

•   dma_buf_fd_install(dmabuf, fd);
    *prime_fd = fd;
    return 0;
  

}

2.34.1