Re: [PATCH v2 RESEND] drm/i915/display: Add check for alloc_ordered_workqueue() and alloc_workqueue()

[Jani Nikula <jani.nikula@linux.intel.com>]

On Thu, 24 Apr 2025, Haoxiang Li <haoxiang_li2024@163.com> wrote:
> Add check for the return value of alloc_ordered_workqueue()
> and alloc_workqueue(). Furthermore, if some allocations fail,
> cleanup works are added to avoid potential memory leak problem.
>
> Fixes: 40053823baad ("drm/i915/display: move modeset probe/remove functions to intel_display_driver.c")
> Cc: stable@vger.kernel.org
> Signed-off-by: Haoxiang Li <haoxiang_li2024@163.com>

This patch seems to have been neglected, apologies.

I've rebased it and included it as part of a bigger series [1].

Thanks for the patch.

BR,
Jani.


[1] https://lore.kernel.org/r/cover.1747397638.git.jani.nikula@intel.com



> ---
> Changes in v2:
> - Split the compound conditional statement into separate
>   conditional statements to facilitate cleanup works.
> - Add cleanup works to destory work queues if allocations fail,
>   and modify the later goto destination to do the full excercise.
> - modify the patch description. Thanks, Jani!
> ---
>  .../drm/i915/display/intel_display_driver.c   | 30 +++++++++++++++----
>  1 file changed, 25 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_display_driver.c b/drivers/gpu/drm/i915/display/intel_display_driver.c
> index 31740a677dd8..ac94561715dc 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_driver.c
> +++ b/drivers/gpu/drm/i915/display/intel_display_driver.c
> @@ -241,31 +241,45 @@ int intel_display_driver_probe_noirq(struct intel_display *display)
>  	intel_dmc_init(display);
>  
>  	display->wq.modeset = alloc_ordered_workqueue("i915_modeset", 0);
> +	if (!display->wq.modeset) {
> +		ret = -ENOMEM;
> +		goto cleanup_vga_client_pw_domain_dmc;
> +	}
> +
>  	display->wq.flip = alloc_workqueue("i915_flip", WQ_HIGHPRI |
>  						WQ_UNBOUND, WQ_UNBOUND_MAX_ACTIVE);
> +	if (!display->wq.flip) {
> +		ret = -ENOMEM;
> +		goto cleanup_wq_modeset;
> +	}
> +
>  	display->wq.cleanup = alloc_workqueue("i915_cleanup", WQ_HIGHPRI, 0);
> +	if (!display->wq.cleanup) {
> +		ret = -ENOMEM;
> +		goto cleanup_wq_flip;
> +	}
>  
>  	intel_mode_config_init(display);
>  
>  	ret = intel_cdclk_init(display);
>  	if (ret)
> -		goto cleanup_vga_client_pw_domain_dmc;
> +		goto cleanup_wq_cleanup;
>  
>  	ret = intel_color_init(display);
>  	if (ret)
> -		goto cleanup_vga_client_pw_domain_dmc;
> +		goto cleanup_wq_cleanup;
>  
>  	ret = intel_dbuf_init(i915);
>  	if (ret)
> -		goto cleanup_vga_client_pw_domain_dmc;
> +		goto cleanup_wq_cleanup;
>  
>  	ret = intel_bw_init(i915);
>  	if (ret)
> -		goto cleanup_vga_client_pw_domain_dmc;
> +		goto cleanup_wq_cleanup;
>  
>  	ret = intel_pmdemand_init(display);
>  	if (ret)
> -		goto cleanup_vga_client_pw_domain_dmc;
> +		goto cleanup_wq_cleanup;
>  
>  	intel_init_quirks(display);
>  
> @@ -273,6 +287,12 @@ int intel_display_driver_probe_noirq(struct intel_display *display)
>  
>  	return 0;
>  
> +cleanup_wq_cleanup:
> +	destroy_workqueue(display->wq.cleanup);
> +cleanup_wq_flip:
> +	destroy_workqueue(display->wq.flip);
> +cleanup_wq_modeset:
> +	destroy_workqueue(display->wq.modeset);
>  cleanup_vga_client_pw_domain_dmc:
>  	intel_dmc_fini(display);
>  	intel_power_domains_driver_remove(display);

-- 
Jani Nikula, Intel