[PATCH] drm: restrict the device list for shadow attached drivers

[Daniel Vetter]

There's really no need for the drm core to keep a list of all
devices of a given driver - the linux device model keeps perfect
track of this already for us.

The exception is old legacy ums drivers using pci shadow attaching.
So rename the lists to make the use case clearer and rip out everything
else.

v2: Rebase on top of David Herrmann's drm device register changes.
Also drop the bogus dev_set_drvdata for platform drivers that somehow
crept into the original version - drivers really should be in full
control of that field.

v3: Initialize driver->legacy_dev_list outside of the loop, spotted by
David Herrmann.

Cc: David Herrmann <dh.herrmann at gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
---
 drivers/gpu/drm/drm_pci.c      | 12 ++++++++++--
 drivers/gpu/drm/drm_platform.c |  1 -
 drivers/gpu/drm/drm_stub.c     |  4 ----
 drivers/gpu/drm/drm_usb.c      |  1 -
 include/drm/drmP.h             |  6 +++---
 5 files changed, 13 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/drm_pci.c b/drivers/gpu/drm/drm_pci.c
index f00d7a9671ea..e92b9567485b 100644
--- a/drivers/gpu/drm/drm_pci.c
+++ b/drivers/gpu/drm/drm_pci.c
@@ -346,6 +346,11 @@ int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent,
 		 driver->name, driver->major, driver->minor, driver->patchlevel,
 		 driver->date, pci_name(pdev), dev->primary->index);
 
+	/* No locking needed since shadow-attach is single-threaded since it may
+	 * only be called from the per-driver module init hook. */
+	if (!drm_core_check_feature(dev, DRIVER_MODESET))
+		list_add_tail(&dev->legacy_dev_list, &driver->legacy_dev_list);
+
 	return 0;
 
 err_pci:
@@ -375,7 +380,6 @@ int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)
 
 	DRM_DEBUG("\n");
 
-	INIT_LIST_HEAD(&driver->device_list);
 	driver->kdriver.pci = pdriver;
 	driver->bus = &drm_pci_bus;
 
@@ -383,6 +387,7 @@ int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)
 		return pci_register_driver(pdriver);
 
 	/* If not using KMS, fall back to stealth mode manual scanning. */
+	INIT_LIST_HEAD(&driver->legacy_dev_list);
 	for (i = 0; pdriver->id_table[i].vendor != 0; i++) {
 		pid = &pdriver->id_table[i];
 
@@ -465,8 +470,11 @@ void drm_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver)
 	if (driver->driver_features & DRIVER_MODESET) {
 		pci_unregister_driver(pdriver);
 	} else {
-		list_for_each_entry_safe(dev, tmp, &driver->device_list, driver_item)
+		list_for_each_entry_safe(dev, tmp, &driver->legacy_dev_list,
+					 legacy_dev_list) {
 			drm_put_dev(dev);
+			list_del(&dev->legacy_dev_list);
+		}
 	}
 	DRM_INFO("Module unloaded\n");
 }
diff --git a/drivers/gpu/drm/drm_platform.c b/drivers/gpu/drm/drm_platform.c
index 56a48033eced..21fc82006b78 100644
--- a/drivers/gpu/drm/drm_platform.c
+++ b/drivers/gpu/drm/drm_platform.c
@@ -147,7 +147,6 @@ int drm_platform_init(struct drm_driver *driver, struct platform_device *platfor
 
 	driver->kdriver.platform_device = platform_device;
 	driver->bus = &drm_platform_bus;
-	INIT_LIST_HEAD(&driver->device_list);
 	return drm_get_platform_dev(platform_device, driver);
 }
 EXPORT_SYMBOL(drm_platform_init);
diff --git a/drivers/gpu/drm/drm_stub.c b/drivers/gpu/drm/drm_stub.c
index 26055abf94ee..047d1d1fb0e1 100644
--- a/drivers/gpu/drm/drm_stub.c
+++ b/drivers/gpu/drm/drm_stub.c
@@ -538,8 +538,6 @@ int drm_dev_register(struct drm_device *dev, unsigned long flags)
 			goto err_unload;
 	}
 
-	list_add_tail(&dev->driver_item, &dev->driver->device_list);
-
 	ret = 0;
 	goto out_unlock;
 
@@ -593,7 +591,5 @@ void drm_dev_unregister(struct drm_device *dev)
 	if (dev->render)
 		drm_put_minor(&dev->render);
 	drm_put_minor(&dev->primary);
-
-	list_del(&dev->driver_item);
 }
 EXPORT_SYMBOL(drm_dev_unregister);
diff --git a/drivers/gpu/drm/drm_usb.c b/drivers/gpu/drm/drm_usb.c
index b179b70e7853..21ae8d96880b 100644
--- a/drivers/gpu/drm/drm_usb.c
+++ b/drivers/gpu/drm/drm_usb.c
@@ -63,7 +63,6 @@ int drm_usb_init(struct drm_driver *driver, struct usb_driver *udriver)
 	int res;
 	DRM_DEBUG("\n");
 
-	INIT_LIST_HEAD(&driver->device_list);
 	driver->kdriver.usb = udriver;
 	driver->bus = &drm_usb_bus;
 
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 54d6c2d36a5b..e3dfbae963a5 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -988,8 +988,8 @@ struct drm_driver {
 	} kdriver;
 	struct drm_bus *bus;
 
-	/* List of devices hanging off this driver */
-	struct list_head device_list;
+	/* List of devices hanging off this driver with stealth attach. */
+	struct list_head legacy_dev_list;
 };
 
 #define DRM_MINOR_UNASSIGNED 0
@@ -1099,7 +1099,7 @@ struct drm_vblank_crtc {
  * may contain multiple heads.
  */
 struct drm_device {
-	struct list_head driver_item;	/**< list of devices per driver */
+	struct list_head legacy_dev_list;/**< list of devices per driver for stealth attach cleanup */
 	char *devname;			/**< For /proc/interrupts */
 	int if_version;			/**< Highest interface version set */
 
-- 
1.8.4.rc3