pipe-loader: move dup(fd) within pipe_loader_drm_probe_fd

Currently pipe_loader_drm_probe_fd takes ownership of the fd given.
To match that, pipe_loader_release closes it.

Yet we have many instances which do not want the change of ownership,
and thus duplicate the fd before passing it to the pipe-loader.

Move the dup() within pipe-loader, explicitly document that and document
all the cases through the codebase.

A trivial git grep -2 pipe_loader_release makes things as obvious as it
gets ;-)

Cc: Leo Liu <[email protected]>
Cc: Thomas Hellstrom <[email protected]>
Cc: Axel Davy <[email protected]>
Cc: Patrick Rudolph <[email protected]>
Signed-off-by: Emil Velikov <[email protected]>
Reviewed-by: Thomas Hellstrom <[email protected]>
Reviewed-by: Axel Davy <[email protected]> (for nine)

1 files changed, 3 insertions, 9 deletions

diff --git a/src/gallium/state_trackers/xa/xa_tracker.c b/src/gallium/state_trackers/xa/xa_tracker.c
index c046a3a7097..d07cd146af9 100644
--- a/src/gallium/state_trackers/xa/xa_tracker.c
+++ b/src/gallium/state_trackers/xa/xa_tracker.c
@@ -27,7 +27,6 @@
  */
 
 #include <unistd.h>
-#include <fcntl.h>
 #include "xa_tracker.h"
 #include "xa_priv.h"
 #include "pipe/p_state.h"
@@ -153,15 +152,11 @@ xa_tracker_create(int drm_fd)
     struct xa_tracker *xa = calloc(1, sizeof(struct xa_tracker));
     enum xa_surface_type stype;
     unsigned int num_formats;
-    int fd;
 
     if (!xa)
 	return NULL;
 
-    if (drm_fd < 0 || (fd = fcntl(drm_fd, F_DUPFD_CLOEXEC, 3)) < 0)
-	goto out_no_fd;
-
-    if (pipe_loader_drm_probe_fd(&xa->dev, fd))
+    if (pipe_loader_drm_probe_fd(&xa->dev, drm_fd))
 	xa->screen = pipe_loader_create_screen(xa->dev);
 
     if (!xa->screen)
@@ -213,9 +208,7 @@ xa_tracker_create(int drm_fd)
  out_no_screen:
     if (xa->dev)
 	pipe_loader_release(&xa->dev, 1);
-    else
-	close(fd);
- out_no_fd:
+
     free(xa);
     return NULL;
 }
@@ -227,6 +220,7 @@ xa_tracker_destroy(struct xa_tracker *xa)
     xa_context_destroy(xa->default_ctx);
     xa->screen->destroy(xa->screen);
     pipe_loader_release(&xa->dev, 1);
+    /* CHECK: The XA API user preserves ownership of the original fd */
     free(xa);
 }