linux-kernel - [PATCH] drm/rockchip: handle non-platform devices in rockchip_drm_endpoint_is

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:   Tue, 14 Sep 2021 17:07:56 +0200
From:   Alex Bee <knaerzche@...il.com>
To:     Sandy Huang <hjc@...k-chips.com>,
        Heiko Stübner <heiko@...ech.de>,
        Andy Yan <andy.yan@...k-chips.com>
Cc:     Jonathan McDowell <noodles@...th.li>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Alex Bee <knaerzche@...il.com>
Subject: [PATCH] drm/rockchip: handle non-platform devices in rockchip_drm_endpoint_is_subdriver

As discussed at [1] rockchip_drm_endpoint_is_subdriver will currently always
return -ENODEV for non-platform-devices (e.g. external i2c bridges), what
makes them never being considered in rockchip_rgb_init.

As suggested at [1] this additionally adds a of_device_is_available for
the node found, which will work for both platform and non-platform devices.
Also we can return early for non-platform-devices if they are enabled,
as rockchip_sub_drivers contains exclusively platform-devices.

[1] https://lore.kernel.org/all/20210316182753.GA25685@earth.li/

Suggested-by: Heiko Stuebner <heiko@...ech.de>
Signed-off-by: Alex Bee <knaerzche@...il.com>
---
 drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
index bfba9793d238..81a5ec30ef4f 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
@@ -275,10 +275,17 @@ int rockchip_drm_endpoint_is_subdriver(struct device_node *ep)
 		return -ENODEV;
 
 	/* status disabled will prevent creation of platform-devices */
+	if (!of_device_is_available(node)) {
+		of_node_put(node);
+		return -ENODEV;
+	}
+
 	pdev = of_find_device_by_node(node);
 	of_node_put(node);
+
+	/* enabled non-platform-devices can immediately return here */
 	if (!pdev)
-		return -ENODEV;
+		return false;
 
 	/*
 	 * All rockchip subdrivers have probed at this point, so

base-commit: 6880fa6c56601bb8ed59df6c30fd390cc5f6dd8f
-- 
2.30.2