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drm/nouveau: Use drm_connector_list_iter_* for iterating connectors 

Every codepath in nouveau that loops through the connector list
currently does so using the old method, which is prone to race
conditions from MST connectors being created and destroyed. This has
been causing a multitude of problems, including memory corruption from
trying to access connectors that have already been freed!

Signed-off-by: Lyude Paul <lyude@redhat.com>
Cc: stable@vger.kernel.org
Cc: Karol Herbst <karolherbst@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
hifive-unleashed-5.1
Lyude Paul 2018-07-13 13:06:32 -04:00 committed by Ben Skeggs
parent 7f073d011f
commit 22b76bbe08
4 changed files with 29 additions and 10 deletions
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6
drivers/gpu/drm/nouveau/nouveau_backlight.c
View File

@ -267,6 +267,7 @@ nouveau_backlight_init(struct drm_device *dev)
struct nouveau_drm *drm = nouveau_drm(dev);
struct nvif_device *device = &drm->client.device;
struct drm_connector *connector;
struct drm_connector_list_iter conn_iter;
INIT_LIST_HEAD(&drm->bl_connectors);
@ -275,7 +276,8 @@ nouveau_backlight_init(struct drm_device *dev)
return 0;
}
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
drm_connector_list_iter_begin(dev, &conn_iter);
drm_for_each_connector_iter(connector, &conn_iter) {
if (connector->connector_type != DRM_MODE_CONNECTOR_LVDS &&
connector->connector_type != DRM_MODE_CONNECTOR_eDP)
continue;
@ -292,7 +294,7 @@ nouveau_backlight_init(struct drm_device *dev)
break;
}
}
drm_connector_list_iter_end(&conn_iter);
return 0;
}

9
drivers/gpu/drm/nouveau/nouveau_connector.c
View File

@ -1208,14 +1208,19 @@ nouveau_connector_create(struct drm_device *dev, int index)
struct nouveau_display *disp = nouveau_display(dev);
struct nouveau_connector *nv_connector = NULL;
struct drm_connector *connector;
struct drm_connector_list_iter conn_iter;
int type, ret = 0;
bool dummy;
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
drm_connector_list_iter_begin(dev, &conn_iter);
drm_for_each_connector_iter(connector, &conn_iter) {
nv_connector = nouveau_connector(connector);
if (nv_connector->index == index)
if (nv_connector->index == index) {
drm_connector_list_iter_end(&conn_iter);
return connector;
}
}
drm_connector_list_iter_end(&conn_iter);
nv_connector = kzalloc(sizeof(*nv_connector), GFP_KERNEL);
if (!nv_connector)

14
drivers/gpu/drm/nouveau/nouveau_connector.h
View File

@ -65,14 +65,20 @@ nouveau_crtc_connector_get(struct nouveau_crtc *nv_crtc)
{
struct drm_device *dev = nv_crtc->base.dev;
struct drm_connector *connector;
struct drm_connector_list_iter conn_iter;
struct nouveau_connector *nv_connector = NULL;
struct drm_crtc *crtc = to_drm_crtc(nv_crtc);
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
if (connector->encoder && connector->encoder->crtc == crtc)
return nouveau_connector(connector);
drm_connector_list_iter_begin(dev, &conn_iter);
drm_for_each_connector_iter(connector, &conn_iter) {
if (connector->encoder && connector->encoder->crtc == crtc) {
nv_connector = nouveau_connector(connector);
break;
}
}
drm_connector_list_iter_end(&conn_iter);
return NULL;
return nv_connector;
}
struct drm_connector *

10
drivers/gpu/drm/nouveau/nouveau_display.c
View File

@ -404,6 +404,7 @@ nouveau_display_init(struct drm_device *dev)
struct nouveau_display *disp = nouveau_display(dev);
struct nouveau_drm *drm = nouveau_drm(dev);
struct drm_connector *connector;
struct drm_connector_list_iter conn_iter;
int ret;
ret = disp->init(dev);
@ -411,10 +412,12 @@ nouveau_display_init(struct drm_device *dev)
return ret;
/* enable hotplug interrupts */
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
drm_connector_list_iter_begin(dev, &conn_iter);
drm_for_each_connector_iter(connector, &conn_iter) {
struct nouveau_connector *conn = nouveau_connector(connector);
nvif_notify_get(&conn->hpd);
}
drm_connector_list_iter_end(&conn_iter);
/* enable flip completion events */
nvif_notify_get(&drm->flip);
@ -427,6 +430,7 @@ nouveau_display_fini(struct drm_device *dev, bool suspend)
struct nouveau_display *disp = nouveau_display(dev);
struct nouveau_drm *drm = nouveau_drm(dev);
struct drm_connector *connector;
struct drm_connector_list_iter conn_iter;
if (!suspend) {
if (drm_drv_uses_atomic_modeset(dev))
@ -439,10 +443,12 @@ nouveau_display_fini(struct drm_device *dev, bool suspend)
nvif_notify_put(&drm->flip);
/* disable hotplug interrupts */
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
drm_connector_list_iter_begin(dev, &conn_iter);
drm_for_each_connector_iter(connector, &conn_iter) {
struct nouveau_connector *conn = nouveau_connector(connector);
nvif_notify_put(&conn->hpd);
}
drm_connector_list_iter_end(&conn_iter);
drm_kms_helper_poll_disable(dev);
disp->fini(dev);