[PATCH AUTOSEL 4.19 12/37] drm/amdgpu/display: Fix reload driver error

Sasha Levin
2019-10-25T14:04:53Z

From: Emily Deng <Emily.Deng@amd.com>

[ Upstream commit 526c654a8a0641d4289bf65effde4d6095bd8384 ]

Issue:
Will have follow error when reload driver:
[ 3986.567739] sysfs: cannot create duplicate filename '/devices/pci0000:00/0000:00:07.0/drm_dp_aux_dev'
[ 3986.567743] CPU: 6 PID: 1767 Comm: modprobe Tainted: G OE 5.0.0-rc1-custom #1
[ 3986.567745] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014
[ 3986.567746] Call Trace:
......
[ 3986.567808] drm_dp_aux_register_devnode+0xdc/0x140 [drm_kms_helper]
......
[ 3986.569081] kobject_add_internal failed for drm_dp_aux_dev with -EEXIST, don't try to register things with the same name in the same directory.

Reproduce sequences:
1.modprobe amdgpu
2.modprobe -r amdgpu
3.modprobe amdgpu

Root cause:
When unload driver, it doesn't unregister aux.

v2: Don't use has_aux

Signed-off-by: Emily Deng <Emily.Deng@amd.com>
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 3b07a316680c2..5209b76262311 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -2870,6 +2870,13 @@ int amdgpu_dm_connector_atomic_get_property(struct drm_connector *connector,
return ret;
}

+static void amdgpu_dm_connector_unregister(struct drm_connector *connector)
+{
+ struct amdgpu_dm_connector *amdgpu_dm_connector = to_amdgpu_dm_connector(connector);
+
+ drm_dp_aux_unregister(&amdgpu_dm_connector->dm_dp_aux.aux);
+}
+
static void amdgpu_dm_connector_destroy(struct drm_connector *connector)
{
struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
@@ -2889,6 +2896,11 @@ static void amdgpu_dm_connector_destroy(struct drm_connector *connector)
#endif
drm_connector_unregister(connector);
drm_connector_cleanup(connector);
+ if (aconnector->i2c) {
+ i2c_del_adapter(&aconnector->i2c->base);
+ kfree(aconnector->i2c);
+ }
+
kfree(connector);
}

@@ -2942,7 +2954,8 @@ static const struct drm_connector_funcs amdgpu_dm_connector_funcs = {
.atomic_duplicate_state = amdgpu_dm_connector_atomic_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
.atomic_set_property = amdgpu_dm_connector_atomic_set_property,
- .atomic_get_property = amdgpu_dm_connector_atomic_get_property
+ .atomic_get_property = amdgpu_dm_connector_atomic_get_property,
+ .early_unregister = amdgpu_dm_connector_unregister
};

static struct drm_encoder *best_encoder(struct drm_connector *connector)
--
2.20.1