static void __optee_disable_shm_cache()

in optee/smc_abi.c [288:322]

• 26 lines of code
• 5 McCabe index (conditional complexity)

static void __optee_disable_shm_cache(struct optee *optee, bool is_mapped)
{
	struct optee_call_waiter w;

	/* We need to retry until secure world isn't busy. */
	optee_cq_wait_init(&optee->call_queue, &w);
	while (true) {
		union {
			struct arm_smccc_res smccc;
			struct optee_smc_disable_shm_cache_result result;
		} res;

		optee->smc.invoke_fn(OPTEE_SMC_DISABLE_SHM_CACHE,
				     0, 0, 0, 0, 0, 0, 0, &res.smccc);
		if (res.result.status == OPTEE_SMC_RETURN_ENOTAVAIL)
			break; /* All shm's freed */
		if (res.result.status == OPTEE_SMC_RETURN_OK) {
			struct tee_shm *shm;

			/*
			 * Shared memory references that were not mapped by
			 * this kernel must be ignored to prevent a crash.
			 */
			if (!is_mapped)
				continue;

			shm = reg_pair_to_ptr(res.result.shm_upper32,
					      res.result.shm_lower32);
			tee_shm_free(shm);
		} else {
			optee_cq_wait_for_completion(&optee->call_queue, &w);
		}
	}
	optee_cq_wait_final(&optee->call_queue, &w);
}