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authorLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>2020-02-21 01:19:22 +0300
committerLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>2021-01-05 08:20:35 +0300
commitb1dda997a8a98fcb98189e5f4ee3108bc3da3d21 (patch)
tree3bfa36905d3e1c1a8f6b909fe8bcb726fe8da2ce
parent8dbe1b4a15977f31f6b3b79e577ad96a795c9827 (diff)
downloadlinux-b1dda997a8a98fcb98189e5f4ee3108bc3da3d21.tar.xz
drm: Use a const drm_driver for legacy PCI devices
Now that the legacy PCI support code doesn't need to write to the drm_driver structure, it can be treated as const through the whole DRM core, unconditionally. This allows declaring the structure as const in all drivers, removing one possible attack vector. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
-rw-r--r--drivers/gpu/drm/drm_drv.c4
-rw-r--r--drivers/gpu/drm/drm_pci.c8
-rw-r--r--include/drm/drm_device.h4
-rw-r--r--include/drm/drm_legacy.h10
4 files changed, 11 insertions, 15 deletions
diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
index 734303802bc3..3f57e880685e 100644
--- a/drivers/gpu/drm/drm_drv.c
+++ b/drivers/gpu/drm/drm_drv.c
@@ -589,11 +589,7 @@ static int drm_dev_init(struct drm_device *dev,
kref_init(&dev->ref);
dev->dev = get_device(parent);
-#ifdef CONFIG_DRM_LEGACY
- dev->driver = (struct drm_driver *)driver;
-#else
dev->driver = driver;
-#endif
INIT_LIST_HEAD(&dev->managed.resources);
spin_lock_init(&dev->managed.lock);
diff --git a/drivers/gpu/drm/drm_pci.c b/drivers/gpu/drm/drm_pci.c
index dfb138aaccba..5370e6b492fd 100644
--- a/drivers/gpu/drm/drm_pci.c
+++ b/drivers/gpu/drm/drm_pci.c
@@ -201,7 +201,7 @@ static void drm_pci_agp_init(struct drm_device *dev)
static int drm_get_pci_dev(struct pci_dev *pdev,
const struct pci_device_id *ent,
- struct drm_driver *driver)
+ const struct drm_driver *driver)
{
struct drm_device *dev;
int ret;
@@ -255,7 +255,8 @@ err_free:
*
* Return: 0 on success or a negative error code on failure.
*/
-int drm_legacy_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)
+int drm_legacy_pci_init(const struct drm_driver *driver,
+ struct pci_driver *pdriver)
{
struct pci_dev *pdev = NULL;
const struct pci_device_id *pid;
@@ -300,7 +301,8 @@ EXPORT_SYMBOL(drm_legacy_pci_init);
* Unregister a DRM driver shadow-attached through drm_legacy_pci_init(). This
* is deprecated and only used by dri1 drivers.
*/
-void drm_legacy_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver)
+void drm_legacy_pci_exit(const struct drm_driver *driver,
+ struct pci_driver *pdriver)
{
struct drm_device *dev, *tmp;
diff --git a/include/drm/drm_device.h b/include/drm/drm_device.h
index bd5abe7cd48f..939904ae88fc 100644
--- a/include/drm/drm_device.h
+++ b/include/drm/drm_device.h
@@ -76,11 +76,7 @@ struct drm_device {
} managed;
/** @driver: DRM driver managing the device */
-#ifdef CONFIG_DRM_LEGACY
- struct drm_driver *driver;
-#else
const struct drm_driver *driver;
-#endif
/**
* @dev_private:
diff --git a/include/drm/drm_legacy.h b/include/drm/drm_legacy.h
index 852d7451eeb1..8ed04e9be997 100644
--- a/include/drm/drm_legacy.h
+++ b/include/drm/drm_legacy.h
@@ -198,8 +198,10 @@ struct drm_dma_handle *drm_pci_alloc(struct drm_device *dev, size_t size,
size_t align);
void drm_pci_free(struct drm_device *dev, struct drm_dma_handle *dmah);
-int drm_legacy_pci_init(struct drm_driver *driver, struct pci_driver *pdriver);
-void drm_legacy_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver);
+int drm_legacy_pci_init(const struct drm_driver *driver,
+ struct pci_driver *pdriver);
+void drm_legacy_pci_exit(const struct drm_driver *driver,
+ struct pci_driver *pdriver);
#else
@@ -214,13 +216,13 @@ static inline void drm_pci_free(struct drm_device *dev,
{
}
-static inline int drm_legacy_pci_init(struct drm_driver *driver,
+static inline int drm_legacy_pci_init(const struct drm_driver *driver,
struct pci_driver *pdriver)
{
return -EINVAL;
}
-static inline void drm_legacy_pci_exit(struct drm_driver *driver,
+static inline void drm_legacy_pci_exit(const struct drm_driver *driver,
struct pci_driver *pdriver)
{
}