linux-kernel - Re: [PATCH] drm/bridge: anx7625: Prevent endless probe loop

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Date:   Tue, 23 May 2023 19:18:24 +0200
From:   rfoss@...nel.org
To:     Nícolas F . R . A . Prado 
        <nfraprado@...labora.com>
Cc:     Robert Foss <rfoss@...nel.org>, Xin Ji <xji@...logixsemi.com>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        owen <qwt9588@...il.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Marek Vasut <marex@...x.de>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Jonas Karlman <jonas@...boo.se>,
        David Airlie <airlied@...il.com>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Pin-yen Lin <treapking@...omium.org>,
        dri-devel@...ts.freedesktop.org,
        Andrzej Hajda <andrzej.hajda@...el.com>, kernel@...labora.com,
        linux-kernel@...r.kernel.org,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
Subject: Re: [PATCH] drm/bridge: anx7625: Prevent endless probe loop

From: Robert Foss <rfoss@...nel.org>

On Thu, 18 May 2023 15:39:02 -0400, Nícolas F. R. A. Prado wrote:
> During probe, the driver registers i2c dummy devices and populates the
> aux bus, which registers a device for the panel. After doing that, the
> driver can still defer probe if needed. This ordering of operations is
> troublesome however, because the deferred probe work will retry probing
> all pending devices every time a new device is registered. Therefore, if
> modules need to be loaded in order to satisfy the dependencies for this
> driver to complete probe, the kernel will stall, since it'll keep trying
> to probe the anx7625 driver, but never succeed, given that modules would
> only be loaded after the deferred probe work completes.
> 
> [...]

Applied, thanks!

[1/1] drm/bridge: anx7625: Prevent endless probe loop
      https://cgit.freedesktop.org/drm/drm-misc/commit/?id=1464e48d69ab



Rob