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drm/amdgpu: use .early_unregister hook to remove DP AUX i2c 

When DisplayPort AUX channel i2c adapter is registered, drm_connector's
kdev member is used as a parent, so we get sysfs structure like:
  /drm/card1/card1-DP-2/i2c-12
Because of that, there is a problem when drm core (and not the driver)
calls drm_connector_unregister(), it removes parent sysfs entries
('card1-DP-2' in our example) while the i2c adapter is still registered.
Later we get a WARN when we try to unregister the i2c adapter:

  WARNING: CPU: 3 PID: 1374 at fs/sysfs/group.c:243 sysfs_remove_group+0x14c/0x150
  sysfs group ffffffff82911e40 not found for kobject 'i2c-12'

To fix it, we can use the .early_unregister hook to unregister the i2c
adapter before drm_connector's sysfs is torn down.

Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Grazvydas Ignotas 2016-10-09 20:28:19 +03:00 committed by Alex Deucher
parent 69405d3da9
commit 40492f6079
1 changed files with 12 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c
View File

@ -765,7 +765,7 @@ amdgpu_connector_lvds_detect(struct drm_connector *connector, bool force)
return ret;
}
static void amdgpu_connector_destroy(struct drm_connector *connector)
static void amdgpu_connector_unregister(struct drm_connector *connector)
{
struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector);
@ -773,6 +773,12 @@ static void amdgpu_connector_destroy(struct drm_connector *connector)
drm_dp_aux_unregister(&amdgpu_connector->ddc_bus->aux);
amdgpu_connector->ddc_bus->has_aux = false;
}
}
static void amdgpu_connector_destroy(struct drm_connector *connector)
{
struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector);
amdgpu_connector_free_edid(connector);
kfree(amdgpu_connector->con_priv);
drm_connector_unregister(connector);
@ -826,6 +832,7 @@ static const struct drm_connector_funcs amdgpu_connector_lvds_funcs = {
.dpms = drm_helper_connector_dpms,
.detect = amdgpu_connector_lvds_detect,
.fill_modes = drm_helper_probe_single_connector_modes,
.early_unregister = amdgpu_connector_unregister,
.destroy = amdgpu_connector_destroy,
.set_property = amdgpu_connector_set_lcd_property,
};
@ -936,6 +943,7 @@ static const struct drm_connector_funcs amdgpu_connector_vga_funcs = {
.dpms = drm_helper_connector_dpms,
.detect = amdgpu_connector_vga_detect,
.fill_modes = drm_helper_probe_single_connector_modes,
.early_unregister = amdgpu_connector_unregister,
.destroy = amdgpu_connector_destroy,
.set_property = amdgpu_connector_set_property,
};
@ -1203,6 +1211,7 @@ static const struct drm_connector_funcs amdgpu_connector_dvi_funcs = {
.detect = amdgpu_connector_dvi_detect,
.fill_modes = drm_helper_probe_single_connector_modes,
.set_property = amdgpu_connector_set_property,
.early_unregister = amdgpu_connector_unregister,
.destroy = amdgpu_connector_destroy,
.force = amdgpu_connector_dvi_force,
};
@ -1493,6 +1502,7 @@ static const struct drm_connector_funcs amdgpu_connector_dp_funcs = {
.detect = amdgpu_connector_dp_detect,
.fill_modes = drm_helper_probe_single_connector_modes,
.set_property = amdgpu_connector_set_property,
.early_unregister = amdgpu_connector_unregister,
.destroy = amdgpu_connector_destroy,
.force = amdgpu_connector_dvi_force,
};
@ -1502,6 +1512,7 @@ static const struct drm_connector_funcs amdgpu_connector_edp_funcs = {
.detect = amdgpu_connector_dp_detect,
.fill_modes = drm_helper_probe_single_connector_modes,
.set_property = amdgpu_connector_set_lcd_property,
.early_unregister = amdgpu_connector_unregister,
.destroy = amdgpu_connector_destroy,
.force = amdgpu_connector_dvi_force,
};