static void megasas_teardown_frame_pool(struct megasas_instance *instance)
{
	int i;
	u16 max_cmd = instance->max_mfi_cmds;
	struct megasas_cmd *cmd;

	if (!instance->frame_dma_pool)
		return;

	/*
	 * Return all frames to pool
	 */
	for (i = 0; i < max_cmd; i++) {

		cmd = instance->cmd_list[i];

		if (cmd->frame)
			dma_pool_free(instance->frame_dma_pool, cmd->frame,
				      cmd->frame_phys_addr);

		if (cmd->sense)
			dma_pool_free(instance->sense_dma_pool, cmd->sense,
				      cmd->sense_phys_addr);
	}

	/*
	 * Now destroy the pool itself
	 */
	dma_pool_destroy(instance->frame_dma_pool);
	dma_pool_destroy(instance->sense_dma_pool);

	instance->frame_dma_pool = NULL;
	instance->sense_dma_pool = NULL;
}

The product dereferences a pointer that it expects to be valid but is NULL.