int amdtee_map_shmem()

in amdtee/core.c [340:380]

• 30 lines of code
• 4 McCabe index (conditional complexity)

int amdtee_map_shmem(struct tee_shm *shm)
{
	struct amdtee_context_data *ctxdata;
	struct amdtee_shm_data *shmnode;
	struct shmem_desc shmem;
	int rc, count;
	u32 buf_id;

	if (!shm)
		return -EINVAL;

	shmnode = kmalloc(sizeof(*shmnode), GFP_KERNEL);
	if (!shmnode)
		return -ENOMEM;

	count = 1;
	shmem.kaddr = shm->kaddr;
	shmem.size = shm->size;

	/*
	 * Send a MAP command to TEE and get the corresponding
	 * buffer Id
	 */
	rc = handle_map_shmem(count, &shmem, &buf_id);
	if (rc) {
		pr_err("map_shmem failed: ret = %d\n", rc);
		kfree(shmnode);
		return rc;
	}

	shmnode->kaddr = shm->kaddr;
	shmnode->buf_id = buf_id;
	ctxdata = shm->ctx->data;
	mutex_lock(&ctxdata->shm_mutex);
	list_add(&shmnode->shm_node, &ctxdata->shm_list);
	mutex_unlock(&ctxdata->shm_mutex);

	pr_debug("buf_id :[%x] kaddr[%p]\n", shmnode->buf_id, shmnode->kaddr);

	return 0;
}