linux-kernel - Re: [PATCH RESEND v2] drm/vc4: fix infinite EPROBE

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Message-ID: <174955839350.2151021.5976827283402219676.b4-ty@kernel.org>
Date: Tue, 10 Jun 2025 14:26:37 +0200
From: Maxime Ripard <mripard@...nel.org>
To: Dave Stevenson <dave.stevenson@...pberrypi.com>,
	Maíra Canal <mcanal@...lia.com>,
	Raspberry Pi Kernel Maintenance <kernel-list@...pberrypi.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Dmitry Baryshkov <lumag@...nel.org>,
	Gabriel Dalimonte <gabriel.dalimonte@...il.com>
Cc: Maxime Ripard <mripard@...nel.org>,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND v2] drm/vc4: fix infinite EPROBE_DEFER loop

On Sun, 01 Jun 2025 12:45:36 -0400, Gabriel Dalimonte wrote:
> `vc4_hdmi_audio_init` calls `devm_snd_dmaengine_pcm_register` which may
> return EPROBE_DEFER. Calling `drm_connector_hdmi_audio_init` adds a
> child device. The driver model docs[1] state that adding a child device
> prior to returning EPROBE_DEFER may result in an infinite loop.
> 
> [1] https://www.kernel.org/doc/html/v6.14/driver-api/driver-model/driver.html
> 
> [...]

Applied to misc/kernel.git (drm-misc-fixes).

Thanks!
Maxime