From: Ville Syrjälä <ville.syrj...@linux.intel.com>
Currently if drm_sysfs_connector_add() fails, it can leave connector->kdev
populated with an ERR_PTR value, or pointing to an already freed device.
Use a temporary kdev pointer during drm_sysfs_connector_add(), and
only set connector->kdev if the function succeeds. This avoids oopsing
if drm_sysfs_connector_add() gets called for a connector where
drm_sysfs_connector_add() previously failed.
Give drm_sysfs_device_add() the same treatment for the sake of
consistency.
v2: s/drm_connector_sysfs_add/drm_sysfs_connector_add
Make drm_sysfs_device_add() tolerate multiple calls
Reviewed-by: Jani Nikula <jani.nik...@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
---
drivers/gpu/drm/drm_sysfs.c | 46 +++++++++++++++++++++++++++------------------
1 file changed, 28 insertions(+), 18 deletions(-)
diff --git a/drivers/gpu/drm/drm_sysfs.c b/drivers/gpu/drm/drm_sysfs.c
index 1a35ea5..95c701a 100644
--- a/drivers/gpu/drm/drm_sysfs.c
+++ b/drivers/gpu/drm/drm_sysfs.c
@@ -370,6 +370,7 @@ static struct bin_attribute edid_attr = {
int drm_sysfs_connector_add(struct drm_connector *connector)
{
struct drm_device *dev = connector->dev;
+ struct device *kdev;
int attr_cnt = 0;
int opt_cnt = 0;
int i;
@@ -378,22 +379,22 @@ int drm_sysfs_connector_add(struct drm_connector
*connector)
if (connector->kdev)
return 0;
- connector->kdev = device_create(drm_class, dev->primary->kdev,
- 0, connector, "card%d-%s",
- dev->primary->index,
drm_get_connector_name(connector));
+ kdev = device_create(drm_class, dev->primary->kdev,
+ 0, connector, "card%d-%s",
+ dev->primary->index,
drm_get_connector_name(connector));
DRM_DEBUG("adding \"%s\" to sysfs\n",
drm_get_connector_name(connector));
- if (IS_ERR(connector->kdev)) {
- DRM_ERROR("failed to register connector device: %ld\n",
PTR_ERR(connector->kdev));
- ret = PTR_ERR(connector->kdev);
+ if (IS_ERR(kdev)) {
+ DRM_ERROR("failed to register connector device: %ld\n",
PTR_ERR(kdev));
+ ret = PTR_ERR(kdev);
goto out;
}
/* Standard attributes */
for (attr_cnt = 0; attr_cnt < ARRAY_SIZE(connector_attrs); attr_cnt++) {
- ret = device_create_file(connector->kdev,
&connector_attrs[attr_cnt]);
+ ret = device_create_file(kdev, &connector_attrs[attr_cnt]);
if (ret)
goto err_out_files;
}
@@ -410,7 +411,7 @@ int drm_sysfs_connector_add(struct drm_connector *connector)
case DRM_MODE_CONNECTOR_Component:
case DRM_MODE_CONNECTOR_TV:
for (opt_cnt = 0; opt_cnt <
ARRAY_SIZE(connector_attrs_opt1); opt_cnt++) {
- ret = device_create_file(connector->kdev,
&connector_attrs_opt1[opt_cnt]);
+ ret = device_create_file(kdev,
&connector_attrs_opt1[opt_cnt]);
if (ret)
goto err_out_files;
}
@@ -419,21 +420,23 @@ int drm_sysfs_connector_add(struct drm_connector
*connector)
break;
}
- ret = sysfs_create_bin_file(&connector->kdev->kobj, &edid_attr);
+ ret = sysfs_create_bin_file(&kdev->kobj, &edid_attr);
if (ret)
goto err_out_files;
/* Let userspace know we have a new connector */
drm_sysfs_hotplug_event(dev);
+ connector->kdev = kdev;
+
return 0;
err_out_files:
for (i = 0; i < opt_cnt; i++)
- device_remove_file(connector->kdev, &connector_attrs_opt1[i]);
+ device_remove_file(kdev, &connector_attrs_opt1[i]);
for (i = 0; i < attr_cnt; i++)
- device_remove_file(connector->kdev, &connector_attrs[i]);
- device_unregister(connector->kdev);
+ device_remove_file(kdev, &connector_attrs[i]);
+ device_unregister(kdev);
out:
return ret;
@@ -501,6 +504,10 @@ EXPORT_SYMBOL(drm_sysfs_hotplug_event);
int drm_sysfs_device_add(struct drm_minor *minor)
{
char *minor_str;
+ struct device *kdev;
+
+ if (minor->kdev)
+ return 0;
if (minor->type == DRM_MINOR_CONTROL)
minor_str = "controlD%d";
@@ -509,13 +516,16 @@ int drm_sysfs_device_add(struct drm_minor *minor)
else
minor_str = "card%d";
- minor->kdev = device_create(drm_class, minor->dev->dev,
- MKDEV(DRM_MAJOR, minor->index),
- minor, minor_str, minor->index);
- if (IS_ERR(minor->kdev)) {
- DRM_ERROR("device create failed %ld\n", PTR_ERR(minor->kdev));
- return PTR_ERR(minor->kdev);
+ kdev = device_create(drm_class, minor->dev->dev,
+ MKDEV(DRM_MAJOR, minor->index),
+ minor, minor_str, minor->index);
+ if (IS_ERR(kdev)) {
+ DRM_ERROR("device create failed %ld\n", PTR_ERR(kdev));
+ return PTR_ERR(kdev);
}
+
+ minor->kdev = kdev;
+
return 0;
}
--
1.8.1.5
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