drm/radeon: add proper locking to the SA v3

Make the suballocator self containing to locking.

v2: split the bugfix into a seperate patch.
v3: remove some unreleated changes.

Sig-off-by: Christian König <deathsimple@vodafone.de>

Signed-off-by: Dave Airlie <airlied@redhat.com>

2 files changed, 7 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 701094b05f47..8a6b1b31bb5e 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -381,6 +381,7 @@ struct radeon_bo_list {
  * alignment).
  */
 struct radeon_sa_manager {
+        spinlock_t              lock;
         struct radeon_bo        *bo;
         struct list_head        sa_bo;
         unsigned                size;
diff --git a/drivers/gpu/drm/radeon/radeon_sa.c b/drivers/gpu/drm/radeon/radeon_sa.c
index 8fbfe69b7bcb..aed0a8c68c84 100644
--- a/drivers/gpu/drm/radeon/radeon_sa.c
+++ b/drivers/gpu/drm/radeon/radeon_sa.c
@@ -37,6 +37,7 @@ int radeon_sa_bo_manager_init(struct radeon_device *rdev,
 {
         int r;
 
+        spin_lock_init(&sa_manager->lock);
         sa_manager->bo = NULL;
         sa_manager->size = size;
         sa_manager->domain = domain;
@@ -139,6 +140,7 @@ int radeon_sa_bo_new(struct radeon_device *rdev,
 
         BUG_ON(align > RADEON_GPU_PAGE_SIZE);
         BUG_ON(size > sa_manager->size);
+        spin_lock(&sa_manager->lock);
 
         /* no one ? */
         head = sa_manager->sa_bo.prev;
@@ -172,6 +174,7 @@ int radeon_sa_bo_new(struct radeon_device *rdev,
         offset += wasted;
         if ((sa_manager->size - offset) < size) {
                 /* failed to find somethings big enough */
+                spin_unlock(&sa_manager->lock);
                 return -ENOMEM;
         }
 
@@ -180,10 +183,13 @@ out:
         sa_bo->offset = offset;
         sa_bo->size = size;
         list_add(&sa_bo->list, head);
+        spin_unlock(&sa_manager->lock);
         return 0;
 }
 
 void radeon_sa_bo_free(struct radeon_device *rdev, struct radeon_sa_bo *sa_bo)
 {
+        spin_lock(&sa_bo->manager->lock);
         list_del_init(&sa_bo->list);
+        spin_unlock(&sa_bo->manager->lock);
 }