drm/nouveau: we need pin_refcnt for nouveau_bo_placement_set()

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
index d409b26..5ece6ef 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
@@ -318,7 +318,7 @@ nouveau_bo_pin(struct nouveau_bo *nvbo, uint32_t memtype)
 
        ret = ttm_bo_reserve(bo, false, false, false, NULL);
        if (ret)
-               goto out;
+               return ret;
 
        if (nvbo->pin_refcnt && !(memtype & (1 << bo->mem.mem_type))) {
                NV_ERROR(drm, "bo %p pinned elsewhere: 0x%08x vs 0x%08x\n", bo,
@@ -327,14 +327,20 @@ nouveau_bo_pin(struct nouveau_bo *nvbo, uint32_t memtype)
                goto out;
        }
 
-       if (nvbo->pin_refcnt)
-               goto ref_inc;
+       if (nvbo->pin_refcnt++)
+               goto out;
 
        nouveau_bo_placement_set(nvbo, memtype, 0);
 
+       /* drop pin_refcnt temporarily, so we don't trip the assertion
+        * in nouveau_bo_move() that makes sure we're not trying to
+        * move a pinned buffer
+        */
+       nvbo->pin_refcnt--;
        ret = nouveau_bo_validate(nvbo, false, false);
        if (ret)
                goto out;
+       nvbo->pin_refcnt++;
 
        switch (bo->mem.mem_type) {
        case TTM_PL_VRAM:
@@ -347,8 +353,6 @@ nouveau_bo_pin(struct nouveau_bo *nvbo, uint32_t memtype)
                break;
        }
 
-ref_inc:
-       nvbo->pin_refcnt++;
 out:
        ttm_bo_unreserve(bo);
        return ret;