Merge tag 'pull-fd' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull 'struct fd' class updates from Al Viro:
 "The bulk of struct fd memory safety stuff

  Making sure that struct fd instances are destroyed in the same scope
  where they'd been created, getting rid of reassignments and passing
  them by reference, converting to CLASS(fd{,_pos,_raw}).

  We are getting very close to having the memory safety of that stuff
  trivial to verify"

* tag 'pull-fd' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (28 commits)
  deal with the last remaing boolean uses of fd_file()
  css_set_fork(): switch to CLASS(fd_raw, ...)
  memcg_write_event_control(): switch to CLASS(fd)
  assorted variants of irqfd setup: convert to CLASS(fd)
  do_pollfd(): convert to CLASS(fd)
  convert do_select()
  convert vfs_dedupe_file_range().
  convert cifs_ioctl_copychunk()
  convert media_request_get_by_fd()
  convert spu_run(2)
  switch spufs_calls_{get,put}() to CLASS() use
  convert cachestat(2)
  convert do_preadv()/do_pwritev()
  fdget(), more trivial conversions
  fdget(), trivial conversions
  privcmd_ioeventfd_assign(): don't open-code eventfd_ctx_fdget()
  o2hb_region_dev_store(): avoid goto around fdget()/fdput()
  introduce "fd_pos" class, convert fdget_pos() users to it.
  fdget_raw() users: switch to CLASS(fd_raw)
  convert vmsplice() to CLASS(fd)
  ...

2 files changed, 10 insertions, 22 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_sched.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_sched.c
index b0a8abc7a8ec..341beec59537 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_sched.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_sched.c
@@ -35,21 +35,19 @@ static int amdgpu_sched_process_priority_override(struct amdgpu_device *adev,
 						  int fd,
 						  int32_t priority)
 {
-	struct fd f = fdget(fd);
+	CLASS(fd, f)(fd);
 	struct amdgpu_fpriv *fpriv;
 	struct amdgpu_ctx_mgr *mgr;
 	struct amdgpu_ctx *ctx;
 	uint32_t id;
 	int r;
 
-	if (!fd_file(f))
+	if (fd_empty(f))
 		return -EINVAL;
 
 	r = amdgpu_file_to_fpriv(fd_file(f), &fpriv);
-	if (r) {
-		fdput(f);
+	if (r)
 		return r;
-	}
 
 	mgr = &fpriv->ctx_mgr;
 	mutex_lock(&mgr->lock);
@@ -57,7 +55,6 @@ static int amdgpu_sched_process_priority_override(struct amdgpu_device *adev,
 		amdgpu_ctx_priority_override(ctx, priority);
 	mutex_unlock(&mgr->lock);
 
-	fdput(f);
 	return 0;
 }
 
@@ -66,31 +63,25 @@ static int amdgpu_sched_context_priority_override(struct amdgpu_device *adev,
 						  unsigned ctx_id,
 						  int32_t priority)
 {
-	struct fd f = fdget(fd);
+	CLASS(fd, f)(fd);
 	struct amdgpu_fpriv *fpriv;
 	struct amdgpu_ctx *ctx;
 	int r;
 
-	if (!fd_file(f))
+	if (fd_empty(f))
 		return -EINVAL;
 
 	r = amdgpu_file_to_fpriv(fd_file(f), &fpriv);
-	if (r) {
-		fdput(f);
+	if (r)
 		return r;
-	}
 
 	ctx = amdgpu_ctx_get(fpriv, ctx_id);
 
-	if (!ctx) {
-		fdput(f);
+	if (!ctx)
 		return -EINVAL;
-	}
 
 	amdgpu_ctx_priority_override(ctx, priority);
 	amdgpu_ctx_put(ctx);
-	fdput(f);
-
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_syncobj.c
index 8e3d2d7060f8..4f2ab8a7b50f 100644
--- a/drivers/gpu/drm/drm_syncobj.c
+++ b/drivers/gpu/drm/drm_syncobj.c
@@ -712,16 +712,14 @@ static int drm_syncobj_fd_to_handle(struct drm_file *file_private,
 				    int fd, u32 *handle)
 {
 	struct drm_syncobj *syncobj;
-	struct fd f = fdget(fd);
+	CLASS(fd, f)(fd);
 	int ret;
 
-	if (!fd_file(f))
+	if (fd_empty(f))
 		return -EINVAL;
 
-	if (fd_file(f)->f_op != &drm_syncobj_file_fops) {
-		fdput(f);
+	if (fd_file(f)->f_op != &drm_syncobj_file_fops)
 		return -EINVAL;
-	}
 
 	/* take a reference to put in the idr */
 	syncobj = fd_file(f)->private_data;
@@ -739,7 +737,6 @@ static int drm_syncobj_fd_to_handle(struct drm_file *file_private,
 	} else
 		drm_syncobj_put(syncobj);
 
-	fdput(f);
 	return ret;
 }