summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/drm_bufs.c
diff options
context:
space:
mode:
authorDaniel Vetter <daniel.vetter@ffwll.ch>2016-06-21 11:54:12 +0300
committerDaniel Vetter <daniel.vetter@ffwll.ch>2016-06-21 22:43:24 +0300
commit95c081c17f284de50eaca60d4d55643a64d39019 (patch)
treec67aa3d3c9008fc1b91d26b58fc9d57f1f820aab /drivers/gpu/drm/drm_bufs.c
parent84601dbdea36634a300c24f93b149a251fc64fed (diff)
downloadlinux-95c081c17f284de50eaca60d4d55643a64d39019.tar.xz
drm: Move master pointer from drm_minor to drm_device
There can only be one current master, and it's for the overall device. Render/control minors don't support master-based auth at all. This simplifies the master logic a lot, at least in my eyes: All these additional pointer chases are just confusing. While doing the conversion I spotted some locking fail: - drm_lock/drm_auth check dev->master without holding the master_mutex. This is fallout from commit c996fd0b956450563454e7ccc97a82ca31f9d043 Author: Thomas Hellstrom <thellstrom@vmware.com> Date: Tue Feb 25 19:57:44 2014 +0100 drm: Protect the master management with a drm_device::master_mutex v3 but I honestly don't care one bit about those old legacy drivers using this. - debugfs name info should just grab master_mutex. - And the fbdev helper looked at it to figure out whether someone is using KMS. We just need a consistent value, so READ_ONCE. Aside: We should probably check if anyone has opened a control node too, but I guess current userspace doesn't really do that yet. v2: Balance locking, reported by Julia. v3: Rebase on top of Chris' oops fixes. Cc: Julia Lawall <julia.lawall@lip6.fr> Cc: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> (v2) Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com> (v2) Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1466499262-18717-1-git-send-email-daniel.vetter@ffwll.ch
Diffstat (limited to 'drivers/gpu/drm/drm_bufs.c')
-rw-r--r--drivers/gpu/drm/drm_bufs.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/gpu/drm/drm_bufs.c b/drivers/gpu/drm/drm_bufs.c
index 9b34158c0f77..c3a12cd8bd0d 100644
--- a/drivers/gpu/drm/drm_bufs.c
+++ b/drivers/gpu/drm/drm_bufs.c
@@ -51,7 +51,7 @@ static struct drm_map_list *drm_find_matching_map(struct drm_device *dev,
*/
if (!entry->map ||
map->type != entry->map->type ||
- entry->master != dev->primary->master)
+ entry->master != dev->master)
continue;
switch (map->type) {
case _DRM_SHM:
@@ -245,12 +245,12 @@ static int drm_addmap_core(struct drm_device * dev, resource_size_t offset,
map->offset = (unsigned long)map->handle;
if (map->flags & _DRM_CONTAINS_LOCK) {
/* Prevent a 2nd X Server from creating a 2nd lock */
- if (dev->primary->master->lock.hw_lock != NULL) {
+ if (dev->master->lock.hw_lock != NULL) {
vfree(map->handle);
kfree(map);
return -EBUSY;
}
- dev->sigdata.lock = dev->primary->master->lock.hw_lock = map->handle; /* Pointer to lock */
+ dev->sigdata.lock = dev->master->lock.hw_lock = map->handle; /* Pointer to lock */
}
break;
case _DRM_AGP: {
@@ -356,7 +356,7 @@ static int drm_addmap_core(struct drm_device * dev, resource_size_t offset,
mutex_unlock(&dev->struct_mutex);
if (!(map->flags & _DRM_DRIVER))
- list->master = dev->primary->master;
+ list->master = dev->master;
*maplist = list;
return 0;
}