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From:   Thomas Hebb <tommyhebb@gmail.com>
To:     linux-kernel@vger.kernel.org, Heiko Stuebner <heiko@sntech.de>
Cc:     Thomas Hebb <tommyhebb@gmail.com>, stable@vger.kernel.org,
        Andrzej Hajda <a.hajda@samsung.com>,
        Daniel Vetter <daniel@ffwll.ch>,
        David Airlie <airlied@linux.ie>,
        Sandy Huang <hjc@rock-chips.com>,
        dri-devel@lists.freedesktop.org,
        linux-arm-kernel@lists.infradead.org,
        linux-rockchip@lists.infradead.org
Subject: [RESEND PATCH] drm/rockchip: dsi: remove extra component_del() call
Date:   Sun, 13 Dec 2020 12:57:26 -0800
Message-Id: <149477f8d5d5a76c624766cb8cbdfdb3fa416ee8.1607893019.git.tommyhebb@gmail.com>
MIME-Version: 1.0
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Precedence: bulk

commit cf6d100dd238 ("drm/rockchip: dsi: add dual mipi support") added
this devcnt field and call to component_del(). However, these both
appear to be erroneous changes left over from an earlier version of the
patch. In the version merged, nothing ever modifies devcnt, meaning
component_del() runs unconditionally and in addition to the
component_del() calls in dw_mipi_dsi_rockchip_host_detach(). The second
call fails to delete anything and produces a warning in dmesg.

If we look at the previous version of the patch[1], however, we see that
it had logic to calculate devcnt and call component_add() in certain
situations. This was removed in v6, and the fact that the deletion code
was not appears to have been an oversight.

[1] https://patchwork.kernel.org/project/dri-devel/patch/20180821140515.22246-8-heiko@sntech.de/

Fixes: cf6d100dd238 ("drm/rockchip: dsi: add dual mipi support")
Cc: stable@vger.kernel.org
Signed-off-by: Thomas Hebb <tommyhebb@gmail.com>
---
Resending since I wasn't subscribed to dri-devel

 drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c
index 542dcf7eddd6..ce044db8c97e 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c
@@ -243,7 +243,6 @@ struct dw_mipi_dsi_rockchip {
 	struct dw_mipi_dsi *dmd;
 	const struct rockchip_dw_dsi_chip_data *cdata;
 	struct dw_mipi_dsi_plat_data pdata;
-	int devcnt;
 };
 
 struct dphy_pll_parameter_map {
@@ -1121,9 +1120,6 @@ static int dw_mipi_dsi_rockchip_remove(struct platform_device *pdev)
 {
 	struct dw_mipi_dsi_rockchip *dsi = platform_get_drvdata(pdev);
 
-	if (dsi->devcnt == 0)
-		component_del(dsi->dev, &dw_mipi_dsi_rockchip_ops);
-
 	dw_mipi_dsi_remove(dsi->dmd);
 
 	return 0;
-- 
2.29.2