[PATCH RFC POC 35/50] ALSA: compress: install the task descriptors when the ioctl returns

@@ -1065,7 +1065,8 @@ static u64 snd_compr_seqno_next(struct snd_compr_stream *stream)
 static int snd_compr_task_new(struct snd_compr_stream *stream, struct snd_compr_task *utask)
 {
 	struct snd_compr_task_runtime *task;
-	int retval, fd_i, fd_o;
+	int retval;
+	const struct fd_slot *fd_i, *fd_o;
 
 	if (stream->runtime->total_tasks >= stream->runtime->fragments)
 		return -EBUSY;

@@ -1080,29 +1081,26 @@ static int snd_compr_task_new(struct snd_compr_stream *stream, struct snd_compr_
 	if (retval < 0)
 		goto cleanup;
 	/* similar functionality as in dma_buf_fd(), but ensure that both
-	   file descriptors are allocated before fd_install() */
+	   file descriptors are reserved before either is staged */
 	if (!task->input || !task->input->file || !task->output || !task->output->file) {
 		retval = -EINVAL;
 		goto free_driver_task;
 	}
-	fd_i = get_unused_fd_flags(O_WRONLY|O_CLOEXEC);
-	if (fd_i < 0) {
-		retval = fd_i;
+	fd_i = fd_prepare(O_WRONLY|O_CLOEXEC);
+	if (IS_ERR(fd_i)) {
+		retval = PTR_ERR(fd_i);
 		goto free_driver_task;
 	}
-	fd_o = get_unused_fd_flags(O_RDONLY|O_CLOEXEC);
-	if (fd_o < 0) {
-		retval = fd_o;
-		put_unused_fd(fd_i);
+	fd_o = fd_prepare(O_RDONLY|O_CLOEXEC);
+	if (IS_ERR(fd_o)) {
+		retval = PTR_ERR(fd_o);
 		goto free_driver_task;
 	}
 	/* keep dmabuf reference until freed with task free ioctl */
 	get_dma_buf(task->input);
 	get_dma_buf(task->output);
-	fd_install(fd_i, task->input->file);
-	fd_install(fd_o, task->output->file);
-	utask->input_fd = fd_i;
-	utask->output_fd = fd_o;
+	utask->input_fd = fd_stage(fd_i, task->input->file);
+	utask->output_fd = fd_stage(fd_o, task->output->file);
 	list_add_tail(&task->list, &stream->runtime->tasks);
 	stream->runtime->total_tasks++;
 	return 0;