linux-kernel - [PATCH] drm/omap: dsi: Fix deferred probe warnings

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Message-Id: <20230412073954.20601-1-tony@atomide.com>
Date:   Wed, 12 Apr 2023 10:39:53 +0300
From:   Tony Lindgren <tony@...mide.com>
To:     Tomi Valkeinen <tomba@...nel.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Sebastian Reichel <sre@...nel.org>,
        dri-devel@...ts.freedesktop.org, linux-omap@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] drm/omap: dsi: Fix deferred probe warnings

We may not have dsi->dsidev initialized during probe, and that can
lead into various dsi related warnings as omap_dsi_host_detach() gets
called with dsi->dsidev set to NULL.

The warnings can be "Fixed dependency cycle(s)" followed by a
WARNING: CPU: 0 PID: 787 at drivers/gpu/drm/omapdrm/dss/dsi.c:4414.

Let's fix the warnings by checking for a valid dsi->dsidev.

Signed-off-by: Tony Lindgren <tony@...mide.com>
---
 drivers/gpu/drm/omapdrm/dss/dsi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/omapdrm/dss/dsi.c b/drivers/gpu/drm/omapdrm/dss/dsi.c
--- a/drivers/gpu/drm/omapdrm/dss/dsi.c
+++ b/drivers/gpu/drm/omapdrm/dss/dsi.c
@@ -4411,7 +4411,7 @@ static int omap_dsi_host_detach(struct mipi_dsi_host *host,
 {
 	struct dsi_data *dsi = host_to_omap(host);
 
-	if (WARN_ON(dsi->dsidev != client))
+	if (dsi->dsidev && WARN_ON(dsi->dsidev != client))
 		return -EINVAL;
 
 	cancel_delayed_work_sync(&dsi->dsi_disable_work);
-- 
2.40.0