[PATCH 5.17 299/772] drm/msm: properly add and remove internal bridges

Greg Kroah-Hartman
2022-06-07T21:06:37Z

From: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

[ Upstream commit d28ea556267c4f2ec7264ab49f1b1296834321ec ]

Add calls to drm_bridge_add()/drm_bridge_remove() DRM bridges created by
the driver. This fixes the following warning.

WARNING: CPU: 0 PID: 1 at kernel/locking/mutex.c:579 __mutex_lock+0x840/0x9f4
DEBUG_LOCKS_WARN_ON(lock->magic != lock)
Modules linked in:
CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.18.0-rc1-00002-g3054695a0d27-dirty #55
Hardware name: Generic DT based system
unwind_backtrace from show_stack+0x10/0x14
show_stack from dump_stack_lvl+0x58/0x70
dump_stack_lvl from __warn+0xc8/0x1e8
__warn from warn_slowpath_fmt+0x78/0xa8
warn_slowpath_fmt from __mutex_lock+0x840/0x9f4
__mutex_lock from mutex_lock_nested+0x1c/0x24
mutex_lock_nested from drm_bridge_hpd_enable+0x2c/0x84
drm_bridge_hpd_enable from msm_hdmi_modeset_init+0xc0/0x21c
msm_hdmi_modeset_init from mdp4_kms_init+0x53c/0x90c
mdp4_kms_init from msm_drm_bind+0x514/0x698
msm_drm_bind from try_to_bring_up_aggregate_device+0x160/0x1bc
try_to_bring_up_aggregate_device from component_master_add_with_match+0xc4/0xf8
component_master_add_with_match from msm_pdev_probe+0x274/0x350
msm_pdev_probe from platform_probe+0x5c/0xbc
platform_probe from really_probe.part.0+0x9c/0x290
really_probe.part.0 from __driver_probe_device+0xa8/0x13c
__driver_probe_device from driver_probe_device+0x34/0x10c
driver_probe_device from __driver_attach+0xbc/0x178
__driver_attach from bus_for_each_dev+0x74/0xc0
bus_for_each_dev from bus_add_driver+0x160/0x1e4
bus_add_driver from driver_register+0x88/0x118
driver_register from do_one_initcall+0x6c/0x334
do_one_initcall from kernel_init_freeable+0x1bc/0x220
kernel_init_freeable from kernel_init+0x18/0x12c
kernel_init from ret_from_fork+0x14/0x2c

Fixes: 3d3f8b1f8b62 ("drm/bridge: make bridge registration independent of drm flow")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/481778/
Link: https://lore.kernel.org/r/20220411234953.2425280-1-dmitry.baryshkov@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/msm/dp/dp_drm.c | 4 ++++
drivers/gpu/drm/msm/dsi/dsi_manager.c | 3 +++
drivers/gpu/drm/msm/hdmi/hdmi_bridge.c | 3 +++
drivers/gpu/drm/msm/msm_drv.c | 3 +++
4 files changed, 13 insertions(+)

diff --git a/drivers/gpu/drm/msm/dp/dp_drm.c b/drivers/gpu/drm/msm/dp/dp_drm.c
index 26ef41a4c1b6..dca4f9a144e8 100644
--- a/drivers/gpu/drm/msm/dp/dp_drm.c
+++ b/drivers/gpu/drm/msm/dp/dp_drm.c
@@ -230,9 +230,13 @@ struct drm_bridge *msm_dp_bridge_init(struct msm_dp *dp_display, struct drm_devi
bridge->funcs = &dp_bridge_ops;
bridge->encoder = encoder;

+ drm_bridge_add(bridge);
+
rc = drm_bridge_attach(encoder, bridge, NULL, DRM_BRIDGE_ATTACH_NO_CONNECTOR);
if (rc) {
DRM_ERROR("failed to attach bridge, rc=%d\n", rc);
+ drm_bridge_remove(bridge);
+
return ERR_PTR(rc);
}

diff --git a/drivers/gpu/drm/msm/dsi/dsi_manager.c b/drivers/gpu/drm/msm/dsi/dsi_manager.c
index cd7b41b7d518..d95b2cea14dc 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_manager.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_manager.c
@@ -668,6 +668,8 @@ struct drm_bridge *msm_dsi_manager_bridge_init(u8 id)
bridge = &dsi_bridge->base;
bridge->funcs = &dsi_mgr_bridge_funcs;

+ drm_bridge_add(bridge);
+
ret = drm_bridge_attach(encoder, bridge, NULL, 0);
if (ret)
goto fail;
@@ -738,6 +740,7 @@ struct drm_connector *msm_dsi_manager_ext_bridge_init(u8 id)

void msm_dsi_manager_bridge_destroy(struct drm_bridge *bridge)
{
+ drm_bridge_remove(bridge);
}

int msm_dsi_manager_cmd_xfer(int id, const struct mipi_dsi_msg *msg)
diff --git a/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c b/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c
index 68fba4bf7212..9b1b7608ee6d 100644
--- a/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c
+++ b/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c
@@ -15,6 +15,7 @@ void msm_hdmi_bridge_destroy(struct drm_bridge *bridge)
struct hdmi_bridge *hdmi_bridge = to_hdmi_bridge(bridge);

msm_hdmi_hpd_disable(hdmi_bridge);
+ drm_bridge_remove(bridge);
}

static void msm_hdmi_power_on(struct drm_bridge *bridge)
@@ -346,6 +347,8 @@ struct drm_bridge *msm_hdmi_bridge_init(struct hdmi *hdmi)
DRM_BRIDGE_OP_DETECT |
DRM_BRIDGE_OP_EDID;

+ drm_bridge_add(bridge);
+
ret = drm_bridge_attach(hdmi->encoder, bridge, NULL, DRM_BRIDGE_ATTACH_NO_CONNECTOR);
if (ret)
goto fail;
diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 555666e3f960..ef47bd449b46 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -385,6 +385,9 @@ static int msm_drm_uninit(struct device *dev)

drm_mode_config_cleanup(ddev);

+ for (i = 0; i < priv->num_bridges; i++)
+ drm_bridge_remove(priv->bridges[i]);
+
pm_runtime_get_sync(dev);
msm_irq_uninstall(ddev);
pm_runtime_put_sync(dev);
--
2.35.1