From e0bacd2f7e0abf7fd26ab7d12e1cfb96a5350fad Mon Sep 17 00:00:00 2001 From: Ben Skeggs Date: Tue, 30 Jul 2013 11:47:47 +1000 Subject: [PATCH] drm/nouveau/vm: make vm refcount into a kref Never used to be required, but a recent change made it necessary. Reported-by: Maarten Lankhorst Signed-off-by: Ben Skeggs --- .../gpu/drm/nouveau/core/include/subdev/vm.h | 2 +- drivers/gpu/drm/nouveau/core/subdev/vm/base.c | 27 +++++++------------ 2 files changed, 11 insertions(+), 18 deletions(-) diff --git a/drivers/gpu/drm/nouveau/core/include/subdev/vm.h b/drivers/gpu/drm/nouveau/core/include/subdev/vm.h index f2e87b105666..fcf57fa309bf 100644 --- a/drivers/gpu/drm/nouveau/core/include/subdev/vm.h +++ b/drivers/gpu/drm/nouveau/core/include/subdev/vm.h @@ -55,7 +55,7 @@ struct nouveau_vma { struct nouveau_vm { struct nouveau_vmmgr *vmm; struct nouveau_mm mm; - int refcount; + struct kref refcount; struct list_head pgd_list; atomic_t engref[NVDEV_SUBDEV_NR]; diff --git a/drivers/gpu/drm/nouveau/core/subdev/vm/base.c b/drivers/gpu/drm/nouveau/core/subdev/vm/base.c index 67fcb6c852ac..ef3133e7575c 100644 --- a/drivers/gpu/drm/nouveau/core/subdev/vm/base.c +++ b/drivers/gpu/drm/nouveau/core/subdev/vm/base.c @@ -361,7 +361,7 @@ nouveau_vm_create(struct nouveau_vmmgr *vmm, u64 offset, u64 length, INIT_LIST_HEAD(&vm->pgd_list); vm->vmm = vmm; - vm->refcount = 1; + kref_init(&vm->refcount); vm->fpde = offset >> (vmm->pgt_bits + 12); vm->lpde = (offset + length - 1) >> (vmm->pgt_bits + 12); @@ -441,8 +441,9 @@ nouveau_vm_unlink(struct nouveau_vm *vm, struct nouveau_gpuobj *mpgd) } static void -nouveau_vm_del(struct nouveau_vm *vm) +nouveau_vm_del(struct kref *kref) { + struct nouveau_vm *vm = container_of(kref, typeof(*vm), refcount); struct nouveau_vm_pgd *vpgd, *tmp; list_for_each_entry_safe(vpgd, tmp, &vm->pgd_list, head) { @@ -458,27 +459,19 @@ int nouveau_vm_ref(struct nouveau_vm *ref, struct nouveau_vm **ptr, struct nouveau_gpuobj *pgd) { - struct nouveau_vm *vm; - int ret; - - vm = ref; - if (vm) { - ret = nouveau_vm_link(vm, pgd); + if (ref) { + int ret = nouveau_vm_link(ref, pgd); if (ret) return ret; - vm->refcount++; + kref_get(&ref->refcount); } - vm = *ptr; - *ptr = ref; - - if (vm) { - nouveau_vm_unlink(vm, pgd); - - if (--vm->refcount == 0) - nouveau_vm_del(vm); + if (*ptr) { + nouveau_vm_unlink(*ptr, pgd); + kref_put(&(*ptr)->refcount, nouveau_vm_del); } + *ptr = ref; return 0; } -- 2.34.1