Re: drivers/gpu/drm/renesas/rcar-du/rcar_du_encoder.c:72:6-12: inconsistent IS_ERR and PTR_ERR on line 73.

[Luca Ceresoli]

Hello,

On Tue Oct 6, 2026 at 8:40 AM CEST, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   2c3418fffa9d037b2038a6db48be63f9e2291806
> commit: 5b03d4907db93627ef48396f39c3455ce644c946 drm: rcar-du: encoder: convert to of_drm_find_and_get_bridge()
> date:   6 months ago
> config: sparc64-randconfig-r2106-20261005 (https://download.01.org/0day-ci/archive/20261006/202610060853.t5Q4BX8P-lkp@xxxxxxxxx/config)
> compiler: clang version 24.0.0git (https://github.com/llvm/llvm-project 195c81658995a4b7531c30a12c5aef6cf2bbd671)
>
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Fixes: 5b03d4907db9 ("drm: rcar-du: encoder: convert to of_drm_find_and_get_bridge()")
> | Reported-by: kernel test robot <lkp@xxxxxxxxx>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202610060853.t5Q4BX8P-lkp@xxxxxxxxx/
>
> cocci warnings: (new ones prefixed by >>)
>>> drivers/gpu/drm/renesas/rcar-du/rcar_du_encoder.c:72:6-12: inconsistent IS_ERR and PTR_ERR on line 73.

...

> 9a248605980a75 drivers/gpu/drm/rcar-du/rcar_du_encoder.c         Laurent Pinchart 2020-12-03  @72  		if (IS_ERR(bridge))
> 5b03d4907db936 drivers/gpu/drm/renesas/rcar-du/rcar_du_encoder.c Luca Ceresoli    2026-04-09  @73  			return PTR_ERR(no_free_ptr(bridge));

This looks like a false positive to me. I guess this code would not trigger
any warning without the infixed no_free_ptr(). But no_free_ptr(p) is
transparent in the sense that it returns a copy of p.

So I guess no fix is needed for this driver. Just let me know in case I'm
wrong.

Luca

--
Luca Ceresoli, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com