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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Thomas Zimmermann <tzimmermann@suse.de>,
        Maxime Ripard <maxime@cerno.tech>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.19 095/229] drm/mipi-dsi: Detach devices when removing the host
Date:   Mon, 24 Oct 2022 13:30:14 +0200
Message-Id: <20221024113002.116718205@linuxfoundation.org>
In-Reply-To: <20221024112959.085534368@linuxfoundation.org>
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From: Maxime Ripard <maxime@cerno.tech>

[ Upstream commit 668a8f17b5290d04ef7343636a5588a0692731a1 ]

Whenever the MIPI-DSI host is unregistered, the code of
mipi_dsi_host_unregister() loops over every device currently found on that
bus and will unregister it.

However, it doesn't detach it from the bus first, which leads to all kind
of resource leaks if the host wants to perform some clean up whenever a
device is detached.

Fixes: 068a00233969 ("drm: Add MIPI DSI bus support")
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220711173939.1132294-2-maxime@cerno.tech
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/drm_mipi_dsi.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
index 7ed8e510565e..c8c9daecd00d 100644
--- a/drivers/gpu/drm/drm_mipi_dsi.c
+++ b/drivers/gpu/drm/drm_mipi_dsi.c
@@ -305,6 +305,7 @@ static int mipi_dsi_remove_device_fn(struct device *dev, void *priv)
 {
 	struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
 
+	mipi_dsi_detach(dsi);
 	mipi_dsi_device_unregister(dsi);
 
 	return 0;
-- 
2.35.1